HELP Atlas 12x36

I seem to have a foul-up. I broke (re-broke dpo fix) the gear case on the apron on my Atlas 12x36. I called Clausing, and lo and behold they still have them. Same part number as the old manual I have! I paid dearly to have a new one ($80+ dollars), but it doesn't really fit. There are 2 holes for a roll pin and three slot/ holes for the screws.The trouble is that (1) the holes for the roll pins don't line up..(2) using the top hole, the screws can be used but apron binds on rack, using the bottom holes no screw fits...(3) put on without any roll pins and the gear binds when I tighten down the apron. After 3 hrs fiddling, I have made it usable by slightly enlarging the holes, eliminating the roll pins, and adding a washer spacer between the apron and the saddle. It all seems to work but the driven cross feed is a little loose (from the washers). Also the cross feed lever detent ball has no spring, but seems to work ok. Am I headed for problems? Did I Joey this thing up? Thanks in advance Little