Originally Posted by
HillRider
Hi, yes I'm still here.
I never had any problems using my TL-FC10 to pull 105 (FC-1050) and Ultegra square taper cranks from several BB-UN7X and BB-UN5X cartridge bottom brackets, and with the "mushroom tool" insert, it works fine for Octalink (BB-6500) bottom brackets. I have no experience with the BB-1050 Cup-and-Cone type you mention but I see no reason why it shouldn't work.
If your particular combination doesn't work, John's recommendation to use a bearing ball as a spacer is a good one. I expect a small square or hex nut could also be used.
The tip of the TL-FC10 measures 12 mm in diameter, which means it would in fact normally fit nicely into the square hole in the crank for the spindle (the end of which should measure 12.65 mm (JIS) or 12.33 (ISO) across). What I had simply not thought of - nor would really have ever reckoned with - is that the edges of the hole in the crank have been pressed down and inward (possibly with some sort of Octalink extractor or adapter) just enough to prevent the tip of the TL-FC10 from entering to come up against the end of the spindle. The damage is not all that obvious at fist glance, but it’s definitely visible once you know it’s there. I could only see it a strong flashlight. As soon as the coronavirus thing abates, I’ll go shopping for a ball bearing (should be fun) and do as JohnDThompson suggested.
Thank you and JohnDThompson for your help. Stay healthy.