You have to either have a strap maker make you a strap that can be sewn on by you or you have someone sew it onto the watch wire lugs, or even better would be if you could send the case or just mid-case to the strap maker so they can sew on a strap custom made by them to your specs. Also, some strap builders will do a custom strap that has a lip that folds over the lugs then snap closed so the strap can be taken on and off "but understand that this system does not have the same strength as if it were sewn on. Also they have a common strap that folds over and screws closed which is a strong bond but the look is not as nice looking than sewn on but thats a matter of taste. The last option i believe is a long NATO style strap that goes on without ever needing to take lugs off. A great Nato option for vintage pams is to find someone making a vintage compass strap w/GPF buckle but i can get expensive if you can not find a rep of one. I hope this helps? Thanks, R