Exciting New Project

[sjpt]

My normal is to set a big adjustable spanner to the freewheel tool and clamp it in the workmate; then grab the tyre to turn the wheel. (while leaning on the workmate to stop it turning).
Time before last that failed, but with my son pulling the wheel as well it worked.
Last time it failed and no son to hand, big adjustable spanner hit with a lump hammer did it.

 

[chris_n]

Stick a hacksaw blade through the middle, fix it to a hacksaw frame and cut outwards towards the threads. As soon as you get though the threads if there is any remaining on the black bit cut through that then you have the tension that is locking it in place released and it will unscrew easily without compromising the integrity of the housing. You could use other things like a dremmel if you prefer. You could also use the freewheel/cassette removal trick of clamping the BB in a vice and turning the frame.

 

[saneagle]

What's the measurement of the BB, BTW? Is installing a mid-drive without that thing possible on that bike? If not too wide for a mid-drive, cut and file away enough for a mid-drive axle? Cut four equidistant triangles to fit a square bar into the middle, turn it off using a pipe wrench? Or dremel cut a triangular notch on the outside to fit the hook end of that tool you linked above, holding the tool on using the widget Sturmey suggested? Hope you managethe feat, however you go about it.

It's a standard BSA/Shimano type BB. That piece will come out when the tool arrives on Thursday.