I have found endless opinions on mass-manufactured hubs that are either left-side-threaded or 'reversible' or etc. I am not seeking information or opinions on these.
I am also aware of the available aftermarket left-side freewheels, and though opinions on those would be welcome they are not directly related to this question.
I am seeking insights and/or technique advice for adding the threading needed to receive a left-side freewheel onto a steel hub that already has a right-side threaded freewheel but has a smooth left side (unthreaded, no coaster brake or brake disc mount).
Examples would be how you set up your jig to maintain linear alignment as you thread (if you did- and if you freehanded it how did you do that), how you managed the odd shape of the hub in clamping it for the work (without marring/damaging it), is there a particular die carrier/handle you recommend, what stood out as a hiccup or obstacle is setting up, was the small roundover athe very end a problem for beginning the threads, etc etc. Tips on execution and methods.
People will insist on the 'why' here, I suppose - I want to add a second, separate, driveline to the bike, and I do not want to 'double' the right-side freewheel due to layout needs. To reduce rolling resistance from the new driveline, it needs to have a freewheel.
OAL, bearing cap to bearing cap - 149mm
Bearing cap diameter - 35mm for 1st 7.5mm, then 36mm for 7.5mm
Bearing cap end to spoke flange face - 15mm
~7mm on the 35mm dia. section is usable as threaded surface
It's a 'fat bike' rear hub.
Hope someone here has some advice. It's a tricky thing to attempt if you don't have a machine shop.