I never had a percussion rifle that was 100% reliable. There was a reason that centerfire primer and 209 conversions were invented for percussion guns.
As for the OP, take a look at the touch hole location in your TC Renegade, Look closely, the touch hole is low and off center rearward to the pan. Besides that, it has a TC lock, and there IS a reason than L&R makes replacements. TC's were known to have frizzens that wore through the case hardening in short order, so is why that "flint wheel" was invented in the first place. Later TC's had a different ****, and improved frizzen, but folks are still looking for replacement frizzens (using Investarms) or replacing the locks. AFAIK TC always supplied their FLs with those cut agates, and sold those same cut agates as "flints". Wet sawn hard rocks they were, but they aren't flint. Another issue with many FLs, TC included, is a patent breech, and they are the reason for teeth gnashing on both flint and percussion guns.
Put a piece of black or amber flint in most any decent lock and you'll get a shower of sparks. Chert works too, I'm told jade is amazing, and each of these can have teeth put back on them numerous times without a diamond wheel or wet saw.
