G'day Gadge.
Which is even more prone to becoming 'rust-bound', if any moisture gets in there, than a taper fitment.
Probably the best 'penetrating lubricant' to use here, is a 1+1 mix of Acetone and Automatic Transmission Fluid [any type].
Do not under any circumstances use WD-40 - it's useless, in this situation.
I can vouch for that. I got a guy to put WD-40 on one that had plainly sat outside for a lengthy amount of time two days prior to attempting to use my two legged puller on it and it broke trying to slide it off.
Would have been interesting if the 50 50 mix would have made a difference.
