i dont know what machine shop would only charge 20-25 to machine that yoke properly. to make it concentric, it's a little bit of setup involved plus a close diameter fit. you're probably looking at closer to $100 if a shop would even waste their time with it. i know i wouldnt. not knocking the job or conversion or anything, just saying you might want to shop around for pricing on the lathe work before you spend the money on the parts.