Ok guys, I know there was someone who posted about issues with this awhile back, but I can't seem to find the thread. Mine started to get pretty stiff, to the point that I had a hard time locking it in. I found that if you blow out the mechanism with compressed air while working the lock handle w/o the riving knife installed, it cleans all the sawdust out and works like new again.
Ridgid 4512 riving knife hard to lock
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