My Mid 50s J.A.Holland frame, Brit made, had a right side?braze on for the rear mech only. This was threaded for a Brit?Cyclo shifter, I had a Campag Gran Sport rear and front mechs and tried to fit a braze on Campag lever for the rear?( Campag bar con for the front) OF COURSE the bolt wouldn't thread in.Tried to locate a Campag thread bolt for a Brit thread braze on, No luck. SO, I hack sawed the bloody braze on OFF and found open C Campag band on double shifters, after a little filing to get smooth (where I had sawed the right side braze off)?works fine. I KNOW sacrilege RIGHT! ?But it did the job. Looks great. saved me lots of bucks for Campag bar con?to!?Cheers John Crump?OldswawheadedBrit. Parker. Co USA?