Infinitely Variable Offset Arm

Infinitely variable offset arm available on several different machines, for use as replacement or DIY component.  Compatible with the 1/4″ first arm, with connection using thumbscrew passed through 1/4″ rod end, thick or doubled 1/4″ washer, slot in arm, into 1/4-20 hex nut.  12mm used with the 90 watt Chinese motor.  15mm used with the 250 watt Chinese motor.  Set screw includes.  To install, run set screw through threaded hole into slot in motor shaft and tighten securely (threadlock recommended).