On some models of the older genuine Anglepoise lamps the springs are adjustable. On the one I have, the springs terminate at one end in a chrome plated machined part that 'screws' into the end of the spring and is tapped through for the cross drilled stud that hooks onto the peg.
Best to check before you start modifying the original springs.
Ian P
PS I have found that some of the latest LED lamps are significantly lighter than the earlier examples
Edited By Ian P on 05/05/2019 20:16:17