Regarding heating the magnets, my guess is that I would get carried away w/ my torch, as I have been know to.
Been looking at 1mm thick brass washers and small ND disk magnets:
BRASS WASHER 7/16" Dia with 13/64" Hole (18ga) (Pkg of 20)
SuperMagnetMan Super disc magnet
Seems like magnets equally spaced and fixed to the washer w/ silver conductive epoxy might do the trick. I'm not sure of the tolerancing of washers but 13/64" ID = ~5.16mm. The OD of my button stem is 5.14mm, so with a little polishing of the washer, it might make for a highly conductive switch w/ almost zero wobble.
I have what I believe to be a first batch (?) from a trade, sn 487. The brass screw/contact in the switch is threaded typical. So I just held the switch by the bottom button and twisted counter-clockwise. Very straight forward; so it seems like there maybe something else going on w/ yours Turbo, hopefully some else chimes in.
I may place an order w/ rampage soon, like tonight soon. The problem I am having is when I fill my cart, all of a sudden, it's at ~ $297.50. So I've been contemplating selling something locally, an unloved hybrid. If it goes I will pull the rampage trigger.