SCB - - that's a thought - - I'll try the BH to get the sucker out of the hole next time.
Junkman - - - yeah, the MMM. I've had the bx-22 since April of O3, but have not removed the mower yet. I don't have a concrete surface to work on, unless I displace my wife's car from the garage. My '68 Plymouth stays put. So that's not in the cards. The good news is that I've talked to a local contractor to build a workshop/garage for me - - that's why I'm taking down these trees. So, I'll have a tractor surface soon.
Aaardvark - - that's what I did. I'd try to move the stump with tree attached & got nowhere. So I'd amputate, & keep sawing until it was [almost] manageable. I also did a number on the dirt=clay stuck to the roots. The toothbar did a decent job of knocking off extra weight there, too.
I'm currently working on a couple of oaks that are almost one - -just a foot or so apart. Either one would be big for the BX, but as a pair - - they are taking a while. I've got one down & hope to get the next one tomorrow.