agreed that the rifle has been cut down. this will have an effect on the balance of the rifle: it is widely held that the balance point should be about where your left hand (assuming a right handed shooter) goes when you're making a standing unsupported shot (this will be about the rod entry pipe). if your barrel is not a 'swamped' design (i.e. thick at the breech, thin at the middle and flared out a bit at the muzzle), you will probably not get a good balance point in a 42 or longer barrel length. (to fix this, some have gone to the trick of drilling out a bit of the stock under the butt plate and adding some lead shot.) your rifle, I'm pretty sure, does not have a swamped barrel.
straight sided barrels usually balance better in the 36 inch range. in my experience, straight barrels longer than that tend to feel heavy at the muzzle.
as regards the idea of getting Dutch Schoultz' method: if you don't already have a copy, shame on you! I've squandered money on accessories over the years, building a collection of gadgets, sub-thingummies, deal-e-oh's, and general junk which will take days to remove from my cellar and which will confound and confuse my heirs as they ask, "What is all this crap, and why did Dad bother with it???" in my collection of papers is Dutch's method, which I would consider more valuable that all the other gadgets combined. short version: spend the money - you won't regret it!
if you go to the Track of the Wolf website, there's a blurb on how to select the correct flint. if this isn't clear, just give them a call and the sales staff will walk you through it - they have good flints at pretty reasonable prices.
if you can see well enough to shoot without your glasses, that's cool (but you should wear some sort of eye protection). as to my own situation, I would expect that shooting without my glasses might get me arrested for felony wanton endangerment.
don't ever hesitate to ask any question on this forum - you may get a bunch of different answers, but they're all from well - meaning folks who sincerely do want to help.
make good smoke!