I use one of those systems from track regularly. They work nice if you follow a few steps to avoid a mess. 1) Epoxy a small square of leather onto the opposite side of the clamp so the brass doesn't hack up your barrel or stock. That being said, I filed mine larger to accept larger caliber guns. 2) I always lay the gun(home made gun vise) horizontal and upside down(barrel facing down) with the butt higher than the muzzle. That way if I get any leakage(usually from not having it lined up correctly), it doesn't get near the wood or stock finish, both at the touch hole and the muzzle. Then pump away. Follow up with some dry patches, denatured alcohol and BreakFree. As far as your muzzle cap, IMO-that needs to be riveted on.