Been testing these...
...for a month now. Ideal is you drive in dusty areas, but I bought them to make sure the pin dosent fly out. Slight pain to install as they have to be installed from the bone end of the shaft which takes a lot of stretching to do. Despite that, they didnt break and I aided the installing by spraying the inside with slicone.
I have no idea why the ball end dust thingies are included, but since I didnt need them, I found another use for them. I've now installed them on the drive shaft so they sit between the inside hub bearing and the CV joint when installed in the car. Makes it even less prone for dirt to enter. We'll see how they hold up to massive rotational forces...
This is not a company PR campaign, I am in no way associated with TSR, just thought it was a good product you lot should try out. Fits nearly all 1/10th drive shafts, regardless of make as the rubber is stretchable.
Can be found here:
http://cgi.ebay.com/TSR-Tamiya-TRF-5...item27b92aa965