Hi this is my version of angle grinder power file.
Preview for the final product:
Video shows the making:
Here's some pictures from the slots that locks it on position:
Can be locked to two different angles.
Wheel is from the skateboard, same that i use with my pipe sander.
Belt is 30mm x 633mm
Bearings are mounted to arm with two M5 rivet nuts. Nice and clean mounting, and allows to change bearings easily if necessary.
( i have seen people locking them with welds )
Here's a preview to the whole mobile sander consept: