Plug/Vent Liner Problem

[kmeyer]

Hi all. I am getting close to a finished gun. All I needed to do was dril the vent and finish the wood.

Today I marked and drilled the vent for a "white lightning" liner. Unfortunetly the center if the liner is right at the shoulder of the plug threads. The threads of the liner were sticking in quite a bit so I filed them down even with the top of the plug threads. If I file any further, I am afraid I may damage the plug threads.

Now I also realize I made a big mistake by already cutting of the knob on the outside of the line or else I could just pull it and cut it down shorter? Any ideas? Thanks all.

 

[davy]

Why dont you try it first? Take it out and shoot it ... there may be no problem at all if it fires with no issues?

Live and learn ...

Davy

 

[WRussell]

If I'm reading that correctly, it sounds like you could run a tap in the breech to clean up the rest of the protruding liner threads, then notch/groove the breech plug a bit to clear the touch hole.

 

[Birddog6]

I don't quite understand what you are saying. Are you saying that you have Half a vent cone ? and the breech plug is blocking half of the vent ? That will not function properly & you will have a restricted flash channel as some of the flash will hit the plug & bounce back clipping the incoming flash, kinda like stereo speakers clip or water backsplash.

If so you have no choice but to notch the breech plug. You cut a rounded groove across the face of the plug but not all the way across, stop about 1/8" from the edge of the face on the other side.

Next time mark the vent center & move the barrel back when you inlet the barrel as to clear the breechplug if that is the way you want the vent. When I build a gun the first thing I do is remove the breechplug, check out the bore & I mark the length of the breechplug & make a scribe mark at the end of it on the barrel at the lock side. This way I know where to set my barrel & lock. If it is a precarve stock I know how far back to adjust the barrel. I prefer to have my vent liner threads & the breechplug threads not intersecting, so I move the barrel back til I have the vent threads clear of the vent liner threads. :results:

 

[kmeyer]

Sry all. I'll try to do it better this time explaining it. The vent liner is installed. The center of the liner is right at the shoulder of the plug threads. What this means is half of the liner is in the plug threads. When I try to screw in the plug it stops at that point. I will make a notch in the plug for the flash to get through to the breech properly, but first I need to figure out how I can get the plug threaded all the way in. From the inside I filed the liner down to where it's flush with the threads of the barrel, but if I go further will damage theplug threads.

I wish now I would not have cut the outside knob of the vent liner off or I could just back it out and make it shorter. I am trying to decide if there is a fix for this or if I should just try to figure out how to pull the vent liner and cut it shorter. I do have a extra vent liner so if I trash this one it's ok. I just don't know how to get it out either. Thanks again all.

 

[WV-Rocklock]

Use a small screw extractor (easy out) to get the liner out. You have a extra, right?

 

[chuck-ia]

If it were me, I'd take the liner out and start over. Just need an easy out to get the liner out. The local hardware store should sell them, you will probably have to drill the vent hole out a bit for a small easy out. I guess the other option would be to run a proper size tap in and thread the liner (so to speak). I would go with removing the liner though, I am not an expert, just my opppinion. I did the same thing on a trade gun I put a white lightning liner in, the liner was protruding in the barrel just enough so that when I run a cleaning patch down the bore I could feel it stick a bit. I took it out and started over. flinch

 

[kmeyer]

Thanks for the info. I understand both ideas. don't have a tap that big though to retap the plug threads and therebye tap the liner. I think I should just remove it and cut the liner down a bit before putting it in. Thanks again.

PS: Squirrel season opens in 13 days. I can't wait

 

[ffffg]

if you didnt use a end tap but used the tapered tap your hole would have had to go into the breach plug so you could tap the vent liner deep enough for the flash hole liner to go in.. acording to chambers this is correct. there will be a half round hole in the face of the breach plug about 1/4 inch long.. my vent hole is 1 /8 inch ahead of the plug. i got delayed ignition until i increased thehole to .067 inch with numbered drill bit. thats only .004 bigger than 1/16 inch.. try shooting it as it is first, and if it doesnt work drill to .067, and if that doesn work get a new liner and drill the tap hole deeper into to the plug, not a whole lot but a little more.. dave.

 

[Stophel]

Just notch the breechplug. This is S.O.P. Of course the problems with touch hole liners can be avoided by avoiding touch hole liners! eace:

 

[kmeyer]

Notching the plug alone will not help any if I cannot get the plug in all the way though. I think my best bet is just to try and get it out. Then I will cut one down a little shorter before I install it.

 

[Birddog6]

Yes.. Remove the vent liner & mark the position of the notch by sticking a punch thru the vent liner hole & tap a indentation on the threads. DO NOT knock the H out of it or you will mess up the vent threads.

DO NOT try to drill out half a hole on the breech face thru the vent liner hole. This is disaster as you end up with a oblong hole & no threads on 2 sides of the vent liner.

Remove the plug & grind out a notch in the plug, put it back in & insure it has the clearance you need ... I would then remove it & put the vent liner in & shorten it so it doesn't intersect the plug threads. As if this happens upon unbreeching the rifle you have to pull the vent every time.
Cut the vent liner to length & install it & finish that job. Now do same on the breechplug & install it. That should ge ya fixed.

And by the way, you don't have to torque the dickens out of that vent liner. Just snug it up good & let it go. It will not back out on ya.

 

[tg]

There is a pic of a notched plug in Diederots encycopledia circa 1750 so this is not new "problem" ......or solution.
mant builders do it as a matter of dealing with pre-carves.

 

[kmeyer]

I bought a extractor at my local hardware store and cannot believe how easy the vent came out. I will now file a little funnel in the plug after marking it with the plug in. Then after removing the plug, I will reinstall another liner after making sure I file it shorter so it doesn't happen again. Without this forum who knows how bad this could have gone. Thanks again all as I'm back on track.

 

[kmeyer]

It turned out good everyone. Thanks again.

 

[Hoyt]

I think that is what makes building these guns so satisfying..at least with me. I get myself into such fixes and think I've ruined the whole gun and then somehow I find a[url] way...things[/url] work out just fine and the world is okay again.