Indeed, push the bush through 5mm, reream to clear any burr, push the seal in, lip outwards. Seals of OD 1.25 inch can be a bit tight, so buy spares (£2.00 each ) and skim the OD with a file and try.
PS This is not only my thought, it has been done by others in this wicked world, but not in the Link of Malvern yet I fear. Regards PJB.
