Button bellcrank

Ok, so I signed up a little while ago, and have been more or less just lurking about since. It seems I can find answers to any questions I have just by doing a search. But, I have noticed mention about button bellcranks quite a few times, and I think I've figured out the basic concept, you don't use lead outs, instead, the control lines are connected directly to the bell crank with a "loop and button" arrangement. So, my question is, how do you guys go about making the "buttons" and determining the loop size on the control lines?    Thank you in advance.

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.