I'm been scrounging parts for a couple of months now and I'm starting to get something tangible. Here's my take on an Indian (sort of) board track racer.
For any of you looking to match the look of the original board track handlebars on a budget, stainless steel shaft collars welded together work well. They are $8.63 at McMaster-Carr.
The bottom bracket shell is actually a 2-1/2 inch rigid conduit coupler, a lucky find at home depot. It has non-tapered threads all the way through, and an inside diameter of 69mm and change. The outer nuts were a little harder to find but I found them here: http://www.garvinindustries.com/ele...les/chn-250i?gclid=CLO5wvHs7LwCFTQOOgodvUsAVQ
The outer shaft is 40mm stainless steel tube from McMaster-Carr. I found that 40mm is common size for go kart drive shafts so bearings and sprockets are easy to find. The shaft will sit inside a pair of sealed bearings that are 68 OD x 40 ID x 15.
The 16mm quill shaft will ride inside on 35 OD x 16 ID X 11 bearings and will have cottered cranks on the ends.
There will be some spacers and shaft collars keeping everything in line and tight. Most of the parts are inexpensive and readily available on ebay/McMaster-Carr. I'll see if I can take a picture of all the parts before I fit them together.