Probably already done it but loctite was often used on these sorts of things, simmering in some boiling water is usually enough for painless disassembly. I've not had a reason to remove the spider for eons but i've still got a pair of Middleburn RS3's (like on the yellow starship) and always used bearing fit on the square register with some 222 on the stupidly small (m3?) capheads. A few minutes in boiling water and they'd fall apart
