I think you also need one 'cone lockwasher' or/aka 'cone keeper'. I bought a bag several years ago & if I could find them now, I'd offer to send you one. It has two ears for the wrench lands of the right cone, and a third ear that rides in the dropout. No threads. The left cone is left bare since the forward rotation tends to loosen it. Will keep a lookout & let you know. Searched ebay & the web but no luck. You could instead use locknuts as found on the later bikes, no?