Any question answered...

Mm, problem.
Carefully check threads of cog and hub for damage, also some hub/cog combos don't play nice together - google what you have.

Could the slipping have been the cog tightening into place? Excuse my ignorance.

Could the slipping have been the cog tightening into place?

Only once. If it did it again, it's because it backed off when you slowed down, which means either your lock ring wasn't fitted properly or it's fucked.

Only once. If it did it again, it's because it backed off when you slowed down, which means either your lock ring wasn't fitted properly or it's fucked.

Took it out again: managed to get a good slip when powering down to accelerate but no more after that. This time I didn't lock the back up at all. Would I be right to think that the lock ring just needs tightening?

This video, is eh bike 650b?

http://vimeo.com/27844438

Smash it t'fuck with your favouritist hammer, you'll be reet in no time.

I stupidly put a track nut on a Brompton axle. It doesn't fit. But now it won't come off - the axle just turns. If I try holding the other side, the nut on the other side just undoes itself. Ideas? I could try taking the whole axle apart to get a better grip, but am little unsure I'd put it back together right, so suggestions short of compete dismantling would be nice. Thanks!

Hold the axle with a vice or mole grips or suttin, smash t'fuck out of the rest with your Nan's secondary hammer.

Axle vice would be useful, you could also try really, really tightening the locknut against the cone on t'other side and hope that holds more than what you are trying to open, if I understand your problem correctly.

Thanks, I'll try that....oh wait I only have a mallet. Will that do?

P.S. favourite is a three syllable adjective so is preceded with most to create its superlative form.

fnar

Dad...?
Is that you?

Update: Slips once going forward when accelerating and then once when braking. I presume that the cog wasn't tightened enough, leaving some play, and then the lock ring was tightened down acting as a limit to how much it cog will slip.

Does this sound correct?

I bought some SKS Raceblades for my new fixed gear only to find the seatstays to have the wrong angle for them.
The guard nearly touches the tire at the front and has 6-8cm of clearance at the rear.
Is there a way to change the angle on these without fucking them up, or should I accept my failure and sell them on while they're still brand new?

If option B: what mudguards should I get instead? Have to clear 28mm tires, no mudguard mounts at the back, disc brake up front.

If the lockring is tight and the sprocket still slips back and forth, then it sounds like you have a thin sprocket which doesn't overhang the sprocket thread, so the lockring is abutting the step between the threads, not pressing on the sprocket face.

I think the bike is an early seventies Raleigh International, originally 27", fitted with 650b rims and 75mm brakes.

Is there a way...

Yeah. The plastic fingers-tightening widgets have some adjustment.

The plastic fingers-tightening widgets

The what?

Yeah. I know.

Look at the guards. What tightens by hand... that's it. I have no name for it.

[Edit] scratch that - I'm thinking of other SKS 'guards. Sorry! [edit]

Yes, the red Grand Bois tyres only come in 650B.

I miss mine.

Why do all my hydraulic disc brakes die? Is it par for the course, in the UK anyway, for them all, from three different manufacturers, to fail?

Sounds very possible as it's a stock sprocket that came with the bike.

Brakes are death. Innit.

Your a superlative form.

thanks @stevep and @mdcc_tester