When in my late teens, I had the excess headspace on my No.3 pattern Lee Speed corrected by an old cane-farmer who had been an armourer in WWII. His toolbox contained boltheads numbered 1 through 7. The numbers of his spares were marked on with electro-pencil!

His fee for the replacement bolthead? I had to shoot the boar that was getting into his newly-planted sugar-cane from the adjacent rainforest. Got him on the second night...

Still own that rifle.....
It was my first centrefire!