A square taper bottom bracket. I have the correct tool. Fit it to the non-drive side (plastic). Think ‘does it turn clockwise or anti clockwise?

Needn’t have worried as it spins reasonable easily in either direction. Unfortunately neither direction tightens or loosens it.

Suggestions please?

undo the other side and remove the bb from that end.

push the cup from the inside of the bb with a flat bladed screwdriver whilst turning it to remove.

or just burn it out with a blow torch?

Okay, the other side is metal. Please confirm do I turn it clockwise or anticlockwise to loosen it?

Driveside BB is lefthand thread (clockwise to loosen).

driveside anti clockwise to loosen, i.e opposite direction to normal pedal motion

as wwaswas says, if the plastic thread’s gone it’s useless (and obviously not seized to the BB unit if it spins) so you just need to undo the other side

drive side should be left-hand thread (ie comes out clockwise)

If you can, hold the tool in the splines (using a bolt, or QR skewer if axle is hollow – If BB is old it might be bloody stiff to shift & you don’t want the tool slipping

Thanks – that is what I thought but always best to check

Tool held in vice. Frame resting on top and gently turned.

no skin on my knuckles. LBS tomorrow!

bolt the tool into the axle & get stuck in

maybe using some high voltage home-made device in a creative way?

no bolts long enough in the garage

Use a crank bolt and a big washer.

One of these is useful for square bb’s to hold the bb tool in place if you haven’t got a vice

Whose advice are you following about direction to undo?
joe1983 is wrong, scaredypants is right.

Driveside is clockwise to undo.

oops!

I had this problem yesterday (driveside) I used a quick clamp(it will give a bit) to hold the tool on, much like above, then i used a **** off pair of adjustable’s and smacked it very hard with a lump hammer to shock it(clockwise) & hey presto once it moves a touch it will keep going(remember if you use a clamp, especially like above, you won’t get far as you are fighting the clamp), if the threads are really rusty then get some penetrating fluid on there & go back & forth, do not try to get it out in one go as you could ‘pull’ the threads.
Good luck ;o)

Will try a quick clamp in the morning. Ti frame so hopefully no rust

No rust on the frame is not the same as no rust on a steel BB, if you think it’s to tight it probably is, don’t chance it on an expensive frame, shock works well to get a BB moving, but if it remains tight then there must be a reason.

Good luck (again).