I use a grinder to cut the end loops off the 'hardest to get to end'.
Then I put the thing in a fire to burn off the insulation & then I get to pull the loops out easy like.
The outer casing, if its got screws holding the inner bits of steel on, undo them, I use a impact driver or a small cold chisle to turn the screws, once they are loose they turn easylike.
Otherwise I pick out the copper loops, if theres varnish, I burn them first.
The solenoid, I bash the Bakelite part till it breaks & the bits fall out, then I get in & remove the coil, theres a fair bit of copper in the solenoid.
The bolts & nuts can be copper too.