Trying to fit a pair of Tektro dual-pivot brakes to a 1983 Holdsworth professional frame with recessed brakes. The posts are a bit too long, so when I tighten down the nut all the way they flop around with several mm of free play. I assume they were made for aluminum frames with bigger tubes. So possible solutions I can see include putting a spacer on the brake side or cutting down the brake post by about 6mm or so. The spacer is reversible, but I think it will look nicer with the posts trimmed to the appropriate length.

This post is just a reality check. First, am I missing something obvious or a better way? Second I'm leaning towards cutting down the brak post which seems like the better option to me, but if this is a bad idea someone please stop me before I get the hacksaw out.