I've just copied Richard's bar riser setup, and it went pretty simply. Just a matter of a couple of taller spacers and longer bolts. I did have to shorten the heads of the bolts to clear the bar, but it was no big deal. I raised them 21 mm above stock, which looks like a little less than Richard's spacer, but worked with 20 mm longer bolts, and left enough slack in cables and hoses for me to be comfortable with. These are a couple of pics of the new arrangement.
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I haven't ridden it since, but am looking forward to it. I also replaced the rear cowling with the pillion seat, and re-installed the passenger pegs. The PO had taken them off, saying he never carried a passenger.
I also encountered another perplexing feature. The foot peg detents were pretty wimpy, and I kept having the right hand peg flop up if I bumped it, but the passenger pegs, which look identical, had very firm detents, and stayed in position quite well. I took them apart, and discovered that they had two different length springs behind the detent ball, with the rider pegs having a spring only 2/3 or less the length of those in the passenger pegs. I replaced the short springs with some longer ones cut from my gunsmithing spring stock, and they are much better now. I'm just wondering if this was intentional, of if Norton just used different length springs at different times.
Ken