Hello Peter, actually I went through all of your notes on fitting a new or replacement bolt and checking headspace etc, I have nice little binder now. It made for an interesting nights reading, then some head scratching converting what I read to what I saw. The overturn confused me the most until the light bulb went on.

I took it as a step by step process and when in doubt went back and re-checked - it has been an interesting learning experience, when the original bolt gets to me I can do the same for it.