Well I don't have any tools and I certainly have no experience. I'm still interested in the focussing screen idea but I'll probably end up just buying one from katz eye unless it turns out to be easy to trim the one from the ME.

So I have a K100D and generally, I'm happy with it. However, it's a bit tricky with manual focus lenses.

I found out that the focussing screen can be replaced by one with the classic indicator thing. You can buy them for $100USD but I have a Pentax ME body here that's doing nothing... Does anyone here know how hard it would be to trim this screen to suit the K100D? (it's bigger than what the K100D needs)

Since the ME has a prism (instead of mirrors), I have been thinking about the possibility of getting it out and putting it into the K100D. I guess the biggest problem would be if the cavity in the K100D is smaller than what the ME has. Would this have any hope of working? Would it give me a bigger image in the viewfinder? Am I nuts?

Is there a culture of hardware hacking in the [D]SLR world?