Can you use any 1/4” in shaft with a servo 1/4” coupling?

I bought a servo motor coupler that attaches to a 1/4” rod but I need to find a way to fasten a Kevlar strip to it and I think I may be able to use two half round .125” rods with two shaft collar clamps to secure the strip. Would I be able to then connect this pieced 1/4” in rod into the servo motor??

Hi @mellowfellow915 and welcome to the forum.

Which exactly coupler did you buy?

If it has a set screw, and your 1/4" rod can fit in it, then you can assemble it.

Maybe you can provide us a sketch of what you want to assemble?