[FTC]: Wormgear and set screws

[Sasha]

We are using a tetrix wormgear to rotate a robot arm. This provides the necessary torque, but after some time on the field, the set screws in the wormgear get slightly loose, allowing the axle some "play". Not too much - maybe 10 degrees rotation - but with the arm being about 11 inches long,it becomes significant.

Anyone knows of a better way to clamp the axle in the wormgear (other than regularly retightening the set screws, or using threadlocker)? We were even thinking of drilling some small indentations in the flat of the axle, to accept the set screws, but it might weaken the axle too much. Or maybe someone can suggest an alternative wormgear box, which would be small and fit the tetrix motor shaft?