posted this a couple months ago:
Took the sideplate of my 642 centenial, big surprise inside
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Took the side plate off my 642, lock goes Bye Bye
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Today for the first time since I bought my 642, I took off the sideplate.
I removed the lock flag/ locking piece, so no more internal lock. I carry this gun almost every day in a pocket holster, been carrying it for almost 4 years now. shot a couple thousand rounds through it in practice, and never took off the side plate to clean it. Instead I have put a couple drops of oil in it from time to time. I found out a couple things that surprised me. For starters I expected to see a bunch of dirt, lint and dried oil in it. Well it was clean as a whistle with just a hint of the FP10 I have been using to lube it!!!
I discovered that this gun lacks the hammer block safety, I supose it makes sense since the hammer is internal, and the rebound slide performs the safety function. That means its a really bad idea to reduce the trigger return spring on this gun!!!!
The lock flag which is completely internal came right out, but the other parts wouldn't budge, the bushing that holds the cam is pressed very securely into the frame of the 642.
I reassmbled the gun and dry fired it and all looks good.
Rather than risk creating a mess with grease, I sprayed the internals with remington dry lube, and will add a drop of oil or two as I have done in the past.
My gun is now lock free.