Banebot Hex Hub Issues

[PJ-27]

I recently bought a couple of these as an 'easy' way to fix my Banebot wheels to my 4mm MFA motor shaft:

http://www.technobotsonline.com/banebot ... -bore.html

Except I found the grubscrew fixing winds down a small amount and then begins to spin (how is that even possible!?) before it protrudes into the shaft. So no matter how much I do it up I never get enough purchase on the shaft and the wheel falls off.

Anyone else experienced this? Suggested solutions? Considered re-tapping the thread but it appears to be imperial, anyone know which?

Cheers!

[razerdave]

Sorry to dig up and old thread but I have also come across this, but I've come to the conclusion that because these Banebot wheels are american made, so are the grub screws, ergo, they're an imperial size. I can just about get the grub screw down and as soon as it hits any resistance the allen key just spins in the grub screw. I have no allen key that is the right size, always a little too big or a little too small.

[plargen]

just get some cheap imperial 1s from a pound shop

[typhoon_driver]

I wouldn't rely on the grub to hold it. file a flat on the motor shaft and use a key in the keyway