axle retention gizmos

[Brian Evans <brian@uunet.ca>]

Does anybody have a source for the little gizmo's that can be set inside of 
the rotoflex joint on the drive shaft of small formula cars?  I think they 
are a pin that attaches to the axle, and a bearing of some sort that 
attaches to the drive flange on the hewland, such that if the rotoflex 
disintegrates, the drive shaft is prevented from flailing.

Thanks, Brian