I am going to remove a crankset (but NOT the bottom bracket) from a bike and then install a new bottom bracket and that crankset on another bike. I've watched numerous videos and read a couple of manuals so I'm very comfortable with the process. I removed the dustcaps, took a 14mm socket and what came out was a nut rather than a bolt. A quick look back at the manual shows that I simply have the 2nd type of spindle, the one where the bolt section is actually integral to the spindle. Do I simply use the same Park tool and let it press on the end of that bolt/spindle or is there a separate tool that I need? My plan is to measure the spindle once the crankset is off so do I simply measure from the point where the square taper section becomes a bolt?
Also, since I'm going to buy a new cartridge BB, I don't have bolts from the old one so do I need specialized bolts or or are they something I can simply buy at a hardware store?
My final question is chainline. The crankset is coming off of a 1983-85 MTB with what was probably 126mm rear spacing. Can I simply use the same spindle length as is on the BB in that bike or does the fact that the bike the crankset is going on has 135mm spacing change the length of spindle I need? Also, the old bike has a 68mm shell and the "new" bike has a 73mm shell. I'm going to build a single-speed with a spacer kit for the rear wheel so I probably have room to fudge but I want to get the BB length right in case I decide to have a dedicated SS/fixie wheel built in the future or to go back to a full cassette.
Have I forgotten anything here? All of the processes seem pretty straightforward and these are the details that aren't quite clear to me at this point. My inclination is that the normal Park crank removal tool will work and that the same length spindle will work but I won't proceed until I know for sure.