Mine is the one with the shorter stroke, about 3.5 inches, with the body as a one piece casing. I think there one with a longer stroke and multi-piece body
Mine was getting a bit sticky and I tried to get handle off before but no success, it almost looks like it's a press fit, same as the little arms at the end of the cross-pin. I ended up just putting it in a pan and flushed the bottom cross pin with lots of WD-40 until it looked like it was clean and then drenched it with lots of synthetic oil. Now it runs nice and smooth again.
It stays pretty clean except when decapping, primer crud falls into the handle slot and it gets dirty again.
I'll watch this thread with interest, as I'd like to know how to get it apart too.