Been looking for over 5 yrs . As yours worn or do you simply not have one ? Mine became worn on the splines and slipped I ended up using a fork bronze bush which fitted the outside of the footrest hanger and used that to bring the splined part forward by a qtr of an inch which allowed a new part of the spline to take the weight and me to tighten the nut really well.
If you haven'y got one and can get the longer one as RD says cut and weld .
Another thought , bit of a long shot , google "Hawksworth motor cycles Ltd " liverpool L23 , 01519490991 ,the owner is associated with Bridge rd motorcycles crosby anyway he imported lots of A10 bits , this owner is a bit wierd but can at times come up with the goods . Hope that helps
