Button bellcrank

I use button bell cranks all the time. I make my own buttons out of brass on a lathe but I used to do so by using 4-40 blind nuts turned upside down. I would chuck up the blind nut on a screw in the drill press using a jam nut against it and file off the nubs that crush into the wood. Use small screws through the bottom of the bellcrank into the upside down blind nut . Solder or use loc-tite on the assembly. Another method is to use a eyelet for your loop and use a screw and washer to hold it to the bellcrank. I can provide pictures of some if you would like for clarification. Nothing special about making the lines other than when you terminate steel lines, make a double loop when making line sets under .018" vs a single. Spectra lines only need one loop.