Seeing as the OP didn't like the loose jumper, this was good advice. The OP didn't appreciate it, but I think you were helpful, thank
Could always 'fix' the jumper did hundreds as a apprentice!
Two hammers end of jumper rested on one hit end of jumper with other hammer turn it slightly oval will hold it up stem of tap.
Ah, sorry i was confused by your response tbh, so by hammering/flattening the the 'pins' on the jumpers, then placing them forcefully back in the threaded part it was cause them to effectively jam and lift up and down when screwed.
Great idea tbh, sorry i misunderstood.
Plus MANY thanks to everyone who helped with the problem, great advice as usual and it IS much appreciated!!!!