You could try a ‘wavy’ washer. I have the Vertex branded version of this device and it has a ‘C’ shaped spring to increase the friction of the sector arms but I can’t recall it being unsatisfactory. I am about to cut some more gears so I will check to see if it can be improved upon.

I have the C-shaped spring thing. I increased the tension by increasing the bend and then discovered it worked best if inserted opposite the pinch bolt which fixes the angle of dangle. Don’t know why, may be a quirk specific to mine.

I think it is the best value machine tool accessory I have ever bought. Probably made by slave labour or some of Elon’s Optimus jobbies, I don’t care, I have mine.

Smiley face, thumbs up.

Well, I have been using my Vertex branded dividing head today and just as I recalled there was no issue with the sector arms at all. The C-shaped thingy seemed to provide enough friction to allow a smooth rotation without slippage. I agree with Robin, it’s an excellent piece of kit no matter what the brand happens to be or where it originates from.