[John Lowe]

Hi

Vintage wheels, who are a subscriber to the forum, have this on their website -technical section

Tri Wing Spinners
Tri wings to be torqued using a lead hammer of around 5lbs in weight and safety wired.
The safety wire must be pulling the spinner in the direction it tightens.
Adapters and tri wings are left and right hand thread; the RH thread is fitted to the left hand of the vehicle (looking forward from the rear of the vehicle)
A small amount of anti seize compound should be used on the mating surfaces of the wheel and the tri wing.

May be worth an email if further clarification is required.

John