I believe, but..i'm familiar with motors for cars and little little parts who used for RC...i'm scared..they are soooo tiny
However, the gearboxes are not in stock, no matter wich shop. So i'm going to build a simple gearbox on a gearplate with some gears made of steel. For the plate i want to use thick HDPE where i can put the ballbearings in. The weight is acceptable low and i hope that a HDPE-plate will be strong enough to hold that ballbearings.
I hope to be at low weight.