Hi, I have this motor with me, http://www.etonm.com/products_detail/&productId=46.html What I want to do is mount an encoder at the back side of the output shaft of the gearbox. I am trying to figure out how to extend the motor shaft in the rear side. The encoder I am fitting will be optical, and as such will not put any load on the gearbox shaft. I thought of drilling a hole into the shaft's back-side, but then realized, that it may cause the shaft to expand making it press fit into the bearing. Now for obvious reasons, I don't want that to happen. The second idea i though of was to stick a metallic part to the back side of the shaft with a metal adhesive. But my friends told be that's a bad idea, as the adhesive will come off if the motor experiences vibrations, which in my application it will. Please help. Thanks for the reply.