You need to get rid of it and get something moe reliable. something like a good Hawkins:
The only changes I made was to replace the #11 nipple with a musket nipple. I shoot only black powder in it and have no troubles. I mold my own conical, R.E.A.L bullets and great results. My barrel is a 1 in 24" twist rate. I also shoot Barnes expanders. I love this gun.
You can find these sidelocks most everywhere and for a good price. I paid only $179.99 for this one on gun broker site. It shoots conicals very well and I have harvested a few nice deer with it.
Remember, "You get what you pay for!"