snail clean out screw???

[larryours]

Most of all T/C sidelock percussion have a hooked breech.
CVa some models have a snail, it's the part where the nipple goes into, some of the older model looking from the side looks
like a snail, inline with the touch hole on the "snail" is a screw, for cleanout purposes, I guess. I never did fool with that screw, I just took the barrel off, and good old hot soapy water to clean, shot of Wd 40, to displace moisture and dry patches, and 3 caps fired on unloaded gun after cleaning always worked for me.