Pinnacle Nut Torque:
"7) No torque figures are given in the General Instructions and on the early 5/8” BSF Pinnacle Nut I have used 150 lbs/ft – something of a shot in the dark as, even if the shaft, B60074, was made from EN12 steel we have no idea of its heat treatment. In any event, so far, that figure has not produced any damage. For the later 3/4” BSF pinnacle nut, using the same logic, one might go to 260 lbs/ft, however I have not tried that so you're on your own. It is important to re-torque these Pinnacle Nuts frequently. A.C. obviously identified the taper hub/shaft joint as a vulnerable part of the design early on, not only increasing the size of the Pinnacle Nut, but also revising the re-torqueing advice in the later General Instructions to 'first 500 miles, again at 1,000 miles and thereafter at each service.' This would be every 500 miles if you read the service list under the Lubrication Chart - page 46, Ace and page 56, Ace Bristol. As you torque up on the bench some helpful blows with a heavy copper mallet, using a suitable pad, on the centre of the outer drive shaft flange against a padded immovable object for the Hub to sit on, will help to get the taper as tight as possible."
This was a paragraph from some Hub Notes I wrote a while ago for Ace and Cobra and which are available to A.C.O.C. Members, as noted in ACtion
Barrie