Today I did something to my bike thread...

I actually bought something like this first but all it did was tear the bearing race out of the bb leaving the shell in place. Ended up with the cruder tool and hammering to finish the job off. BB appeared to be held in with a locking compound which didn't help matters, I used grease on the replacement.

Just to explain my last comment a bit, regarding this tool. You have to start with the 24mm outer dimension piece as it is the only one that fits past the bearing race. Using this rips out the bearing making for a wider hole. Theoretically, you shoult be able to repeat the procedure with the 25mm piece in the new hole as that is the size of the hole after stripping the bearing race. Didn't work for me as there was additional plastic in there preventing the insertion and proper seating of this bit.

Solution, one of these and a hammer, which is what I saw on any of the press fit BB extraction videos I looked at on youtube

To be fair, the press did a good job for getting the new BB installed. Again, having looked at a few videos and read a few horror stories, I did one side at a time to minimise the risk of the central section not meeting correctly. Given they're greased rather than using a locking compound this time, I expect replacing them next time to be easier.

Not impressed with the fact you have to destroy a component rather than disassemble it in order to get it out.

To be fair, the old BB lasted very well for about six years until it failed. New setup is working well, though the front mech now seems to need further adjustment as dropping from big ring to small ring is only happening on second trimming click on lever. I've bought a new jagwire cable set so that's the next job.