Why am I commenting here? Stumbled across this bike Ole4 did almost two years ago, and figured it was worth re-posting. Bad ass! (and yeah, I am researching swing arm stuff) 
I built a extended swingarm for my speedway used 1" tube sleeved with 3/4 DOM tube and the original steel rod which is the axle for the swingarm. No bushing was needed fit with a couple of thousanths clearance and used mobil 1 synthetic grease when assembling. There is not much motion on the swingarm so the greasing will last for years.
