Hello Rod,
I am not sure why you wish to do this.
My 1947 Flyer has been in the family for over 30 years; a few years ago the forks emptied all the oil during a static period one winter on the garage floor . As a “temporary” remedy I put thicker oil in the forks expecting to have to fit the set of seals we bought years ago from the Panther Club (the first source of new seals) – but the seals are still on the shelf , with no leaks !
David.
