Thanks guys, it looks like I have the BX-640B, as the drive cups are 10mm long, and this is just a bit too short so stop the drive shafts popping out. The BX-640BF might just about do it, but it will not be nice, those dog bones will be running right on the outer limits of the drive cups on full droop, but I guess in the absense of a Worlds specific one way drive cup this will have to do.
I did try a trf-501 cup, but the slots were too small to take the dogbones. Anyone know of a drive cup that would meet the following spec?
shaft diameter 6mm, shaft length 11mm, drive cup length at least 12mm, dog bone slot 2.5mm.
Thanks
Doug
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