Check out my
1650 thread (which I promise will get active again soon) and my 1450 thread. I'm betting that the reason your previous owner couldn't get the ISO mounts to "fit" was because of
what I discovered on my 1450 (which, as far as I could find, was original at OCC for a "find the problem and fix it" because I read *tons* and never found anyone referencing it.)
The QL's are great machines. My 1450 will be rocking this Spring, and the 1650 will be done part-by-part until it's like a new machine, so I don't have a time forecast on that one...