Exactly as I do them on my Bridgeport Interact 4, thread milling is the way to go! ive done Ducati, Morini and even a small 2 stroke Suzuki as well as Nortons
I recently had him do this for my commando. It's worth the money, as it is a fix that is suppose to last. I was pleased with the work. Those pipes are on there tight now. An excellent job.
James Comstock . Watched your video and wondered where you were located and what was the cost for this work you do for my 1970 commando head. Plus the transportation expenses, many thanks in advance. Archibald McKean.