I lost/misplaced the block I replaced. Of course one of them was original and the fibers were worn (to make it look too long) BUT there are a few differences. once (if ever) in as many years as I can remember. Maybe 3 times in the last 20 years? When I first used this unit I thought "great", it fits perfectly and I like having a spare (in fact this is my only module until I find the original). The problem is that when using this device, the "bristle ring" fell out several times. I kept pocketing it, and while I might not have gotten far enough the first few times, I definitely did after the third or fourth time. Even if you push it all the way back, it still falls out. It's so annoying that I'll probably glue a ring (silicone or something) on next time. Not a show stopper, just something I have to stop and do. Would I buy it again? Yes. If the ring didn't fall it would be a 4 star item.
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