again i'm showing my ignorance here but these co2 cartridges do they screw directly onto the tyre valve and then bob's your uncle or is life not as simple as that?
No, they don't screw into the valve, you also have to buy an adapter. Most seem to be pretty one-shot, as well, you can't really use half a cartridge and expect the other half to be still available when you get your next puncture in 3 months.
You also have the issue, as Hottie said, that you might be tempted to carry a spare pump because you will, at some point, need at least one more cartridge than you are carrying.
Is there any chance that you could burst an inner tube with too much pressure?
Yes, but it's more likely that you'll get a very uncomfortable ride first. You'll have to try very hard to over-inflate road tyres with a mini-pump. With a lot of effort, you might over-inflate an MTB tyre but you'll probably need a few days to recover from that sort of exertion.
That mini morph thing looks quite good, but the foot thingy looks a bit insubstantial.
Rats, you could have tried mine at the weekend. I haven't had an issue with the foot yet, although I've only used it "in anger" a handful of times. Damned good pump, though, and both the foot and the swivel handle are very useful.
for my lack of p'tures (touchwood) and its size/weight its a great pump to carry for those odd get me home emergencies. I think if I had more frequent visits from the fairy I'd invest in one of those road morphs.
