XRAY - Model racing cars

The ring does just randomly fall off, I read somewhere to ca glue it and it stays on for the most part. i dont' think it's very important to keeping the belt on the pulley though because the smaller middle gear should do that.

I know what u mean, and I think I will put off this item, but the strange things is, a brand like xray made this stupid matter.
I assembled the car by myself and all the parts were fitted perfectly, I never find a precision like this in any other cars on the market.
For these reason I believe there is somethings wrong in the instruction manual or in my assembly.
if someone from Xray can drive me to the right I will very appreciate.

thanks

You're supposed to glue the the ring for the Multi-diffs pulley on, just take it off and use a thin line of C.A. around the part that intersects the Pulley

actual xray employees seem to be careful about answering questions like this, i never got an answer about why their clutch end piece was 6mm instead of 7mm like everyone elses which causes me less than optimal gap with the new novarossi engines that are 0.2mm shorter than some others.

Do you still have the multidrive instructions? I'm almost sure thats where I saw the glue idea but I don't have them near me right now.