I've owned this nearly 100 year old Brown & Sharpe 0Y horizontal mill for at least 20 years. It has been patiently waiting for me to get around to cleaning it up so it can be used. It's quite a nice little mill; almost ready to be put to work. The last thing I wanted to do was disassemble the spindle assembly to clean up and adjust the bearings and make sure the lubrication system was functioning properly. To disassemble the spindle I needed to loosen this nut.
I purchased a pin spanner just for this nut but broke the pin trying to loosen it.
Looks like I was going to need a bigger wrench. After two months of fitting and fiddling and re-working and building tools to make tools to make other tools I came up with this beefier pin wrench.
You have to take it apart and assemble it onto the nut. First attach the two halves.
Then insert the pins
Then attach the handle.
I had to file notches in the bolt heads so that I could tighten them with the tip of a screwdriver since there was so little space to work in. With the wrench in place I added a pipe wrench to the spindle and gave both a mighty tug hoping that this was not a left hand thread. And....It worked as planned (that doesn't happen often). It was a bit like building the atomic bomb. All that effort and planning for one moment of precisely directed force.
Here is a reenactment of "The Loosening of the Nut".
After that, the spindle disassembled quite easily. It's a really well built machine. Made in Providence, Rhode Island, back when they made stuff in Rhode Island. What to they do in Rhode Island these days? I think it is just one giant marina.