Good sorce for them or what size they are? Just bought a sight that they are missing...

I lost one or two of those myself. I found that 5/64" ball bearings were a perfect replacement. They're evidently often used in remote control car parts, as I got a pack of 10 of them off of eBay from some RC car store for very, very cheap. I wasn't able to find them easily locally.

Thanks , ordered 100, have spares o plenty!