I've ran into a few problems myself. Apparently my Armstrong came with 71mm & 26tpi BB shells. An odd size and swapping out for newer square tapered BB+crank set has now pretty much gone down the drain unless I want to spend a few hundred to convert it...which for this brand bike and purpose its going to be built for is not worth it...so, I opted to keep the original crank+bb set that was on the bike but I've come to find out that the ball bearings have made a groove into the spindle, bearing retainers were gone to dust and that my adjuster cup was cracked.

On top of that the local LBS I went to for help has been giving me wrong information luckily I was able to ask for help here in the mechanics section and they were able to help me figure things out before I spent all that money on parts that would not have worked on the bike. I have been going to another LBS since then and this new store actually has someone that kinda knows and is willing to do the research to help me build this bike. So far they were able to dig up a new adjuster cup for me and at the moment we are looking for a new spindle/axle and as far as the bearings go we will just sit them inside the cups with a lot of grease and put a plastic shield inside to keep dust out. Hopefully this will work I still have to try and figure out how to take the smaller sprocket/gear on the crank for ss/fg use.