sander/grinder collet adapter

[cody michael]

I am not sure if thats the right term, I have a sander, buffer, grinder 7 inch from harborfreight, I use the sanding pad some times, and I have used metal grinding discs etc with the screw on setup, I found some 7 inch metalworking discs for it on sale and bought them, not realizing they don't have threaded insert, you need the collet/nut that clamps them in place, is this something you can buy to use with the grinder? or do you need to buy a specific grinder that has one?

[cody michael]

anybody have any ideas

[Ronald Blue]

Often such grinders come with adapters to allow mounting of several types of wheels. A nut usually to mount wheels/discs without threads. Nothing like that was included?