Thanks, this is pretty much what I figured.
One reason I like centennials, best of all the J frames is few areas for lint, etc to get into mechanism. And one reason I like no lock versions, is one less area for lint, etc to get into mechanism.
I mainly carry centennial in weak side pocket and I use FIST kydex pocket holster. This does provide quite a bit of protection. Plus in this application I like kydex, because I can clean the inside of the holster of dust in the sink and let it dry out overnight.
While I am not experienced in detail stripping revolvers, I have on a couple of occasions removed sideplate and trigger. So as you suggest, I might whenever a slow day occurs take the sideplate off and have a look. I don't expect I will find much, if anything. Thanks again.