seems a bit strange but that is how it was done

The mounting studs are 1-3/4" center to center

and all BSA 1969 and up

Fits most Triumph motorcycles from 1938 all the way through 1967

Valve Adjusting Tool - Triumph / British motorcycles Vendor_A&I Metal Finishing seems a bit strange butThis specialty 4 piece valve adjusting tool makes adjust your valve clearance on your Triumph, BSA or Norton motorcycle a breeze. No more trying to fit a wrench into your rocker box while turning the square adjuster with a crescent wrench. This tool is a perfect fit for the lock nut and the knurled knob makes it easy to adjust your clearance, then hold it steady while you tighten the locknut down in one easy motion. With the different tools included