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@xroads
From the "transmission database" thread, this is my 1984 Pug's setup:
Dotek FG-PRO6-170 + BBUN26 68x113mm + OnOne small flange double fixed hub + Miche1/8sprocket = xroads (42mm chainline with chainring on inner side of spider, chainguard on outer side)
These cranks from the site sponsor are probably the same ones:
http://www.sjscycles.co.uk/product-Dotek-Dotek-Single-Chainset-42T-with-170-mm-Cranks--Silver-23131.htm
I believe my BB was swiss threaded (see sheldon browns page http://www.sheldonbrown.com/velos.html ), as it certainly wasnt french and neither english. However, the BB-UN26 fitted tight, and with a bit persuasive force, it was "converted" to english threading. It has never worked loose, and I have succesfully removed and replaced it with no issues.
I had to swap the whole headset as the original cups were much wider externally to mix and match. You can knock the old cups out easily with a hammer and chisel/driver from the inside.
My Fixed gear gallery link from back then:
http://www.fixedgeargallery.com/2007/nov/3/SirPic_2.htm