I have a Power HD 1235MG purchased from Pololu but have been unable to find anything. The gear od is about .345 in or 8.75 mm. Also I am hoping to find mounting brackets for it. Any ideas?
Unfortunately, I do not know where you can find a coupler that fits that servo, but you might be able to make a coupler by attaching to the hardware that comes with it. You could also use the servo’s spline specifications to look for a solution, or for making your own. You can find this information in the servo’s datasheet, which is located under the Resources tab of its product page.
We do not have brackets for this servo, but you might try searching other hobby shops like ServoCity for accessories that fit this servo.