jt- I'm not sure if you solved this problem yet or not but I had to lengthen my spline cuts as well. My bearing retainer was gooped on with silicone and I didn't want to break the seal and remove it, so my angle grinder wouldn't fit in. I used the "poor man's" dremel tool that I had bought from Harbor Freight for $20.00. It took longer that the grinder would have but it worked fine.
