Spot Shooter: As I mentioned before these kits are about 95% done when they leave the factory but they sometimes require a little "fine tuning".
Things like how well the lock is seated against the bottom of the pocket for instance. It may be floating above the surface because the morticed hole in the stock could be hanging up slightly on the edges of the lock.
How to check this? Use the same method the master gunmakers used in 1750 (and before).
Form a layer of carbon on the backside of the lockplate by holding the back surface IN (not over) a candle flame. You only need this carbon in the area that is going to sit on the wood and you don't have to build up a thick layer so don't leave it in the flame too long.
Now without touching the back side install the lock in the stock and lightly finger press(don't hammer) it in as far as it will go.
When you pull it out if it was touching wood, it will leave a nice black smudge of carbon. If it doesn't do this then it is actually floating above the bottom of the pocket. In that case, the stocks mortice needs enlarging JUST A LITTLE. Work a little, check a lot. It will get there if it isn't already. Don't worry about carbon on the wood where the sides of the lock slide into the mortice. That is normal.
This same kind of check should be made to the trigger plate and any other wood/metal interface to make sure things are seating like they should.
Keep playing with it. We'll turn you into a gunsmith yet!