Any question answered...

Shit, that's nothing! Forget about it, I'm not moving my saddle 2.5mm

Oh, the good old days of Elvis the cannibal

Are all shimano ht2 bb's much of a muchness?

Nothing I could find out about them has managed to convince me I should spend more than Tiagra money. Use that money for facing the BB shell instead.

Bearings in cage in some kind of lightly sealed retainer I'd imagine. Probably heavier than a legit sealed cartridge.

this was my thought too.
thanks!

Don't they still have technicians to sort all that stuff out? We did manage to set a desk on fire but that was with a 'spilled' beaker of officially-supplied ethanol for electrolysis and some wanton sparking.

What I've got is five unlocked school labs and an unlocked ground floor Prep Room with, amongst loads of other things, 4 x 5litre containers of 2M Hydrochloric Acid and a COSSH cupboard with the key in the lock. Also a large dumb waiter lift fully functioning to an upstairs Prep Room where more stuff is accessible. This has all been unlocked since 4.00pm and I'm locking up at 10.00pm.

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Dibs!

Is it your job to give them a bollocking about it?

Is the ice piled in urinals in posh bars/hotels real? It looked convincing enough just now, but couldn't seem to melt it. Mind you I was a bit dehydrated.

Lock up after the cleaners have finished, and assume that anyone who is supposed to be in those rooms will have a key?

It being a school, the fallout from duty of care issues can be prodigious. You can't assume the little buggers will accept rules, read notices, follow instructions or use some common sense. You probably can assume that parents will want a scapegoat when the fruit of their loins demonstrates dangerous stupidity.

As a separate issue, my recollection of COSHH cupboards was that 'lockable' did not mean 'must be locked', but I'm going back a few years...

I know that when I was at school one of us would have stolen something, set something off or just damaged shit or each other. This school is private and relatively expensive so the clientele probably won't be the same as at my school but kids will be kids. Youngsters having full and unrestricted access to everything dangerous in a school science department is at the very least a Health and Safety issue. I just don't know who to alert yet. I'm going to work at 2.00pm and I'll speak to the child protection officer in the first instance.

Would this work with my Rival touring bike?

https://www.uberbikecomponents.com/view-product/Uberbike-Expander-Sprocket-40t-and-42t-options-Gold

Steal something and see if they notice. If not, see how much you can remove before they do.

I can lay my hands on a nice heavy jar of sodium and some pickled rats, take your pick.

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I've got a sticky hood.

...on my ~8year old 5600 shifters. Is there something I can apply to reverse this?

Try talc.

https://www.youtube.com/watch?v=R1Xmg5Gst0U

Cheers @freezing77 - will try!
CRC are selling old 6600 hoods for £10 posted if it doesn't work

These rats; sweet or sour pickled?

Can do either. You can collect, if you're near, the door is always open.

What rear mech do you have, i.e. is it short, medium or long cage?

P.S. If you do buy it use the code SPRING25 to get 25% off.

Friend of mine fixed a similar problem with the rubberised plastic on a shortwave radio with rubbing/isopropyl alchohol.