using piston stop
I was planning on building me one like 67dart showed.
If you build one, like that, I threaded the bolt all the way to the HH, then installed it from the top with a nut under the head about an inch down, with which to jam the assembly solid. Then I machined a few threads off the end that touches the piston and rounded the end. This does not have to be accurate, cuz you are not using it for anything but to stop the piston. By tightening the jam-nut it takes all the wiggle out of system, that come from using a de-porcelained plug shell.
With the jam-nut, now it is adjustable and works in frame with all the accessories bolted on. What I mean is you can get both initial marks visible on the balancer at the same time, making it simple to bisect them. If you make the plunger too long, you may have to extend your initial marks closer to TDC and then bisect. Of course that introduces two more possible errors, er, probable errors.
Notice how
67Dart gives you a measurement. I'm assuming he built it specifically for an SBM, so the plunger is likely fixed in place. That would be OK too.
