02-07-20, 08:54 AM
All my whitworth stuff and AF for that matter, have been confined to a metal box under my workbench, no doubt never to see the light of day again. All I know is the thread required is 16mm at 16tpi. If you remove a bar end weight, you'll need an allen key for that, you'll be able to measure the thread and see what's required.
Whizz kid sitting pretty on his two wheeled stallion.