I just did. I picked up one of these tools at an auction several years
back and never used it.
http://cgi.ebay.com/PORTER-CABLE-MOD...QQcmdZViewItem
It needs a new piece and PC wants hundreds for the part. It's actually
a pretty easy fix, but it was just one of those projects I never got
around to doing because I was just going to sell the tool on eBay and I
didn't pay that much for it.

Now, after reading that auction listing, the light bulb flicked on.
Doh! I could easily modify the tool to make a mortising machine to
replace my Delta bench top unit.

I owe the guy who was asking about his problems with his mortising
machine bits a thank you. I wouldn't have run across that eBay listing
if I hadn't been looking to find you a readily available chisel and bit
set. Thanks!

R