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Yeah, you'll need a bit more leverage than that.
Fashion a cheater bar or two from an old seat post or scaffolding lying about?
BB is already knackered, another ride or two won't matter.
coventry_eagle-
Turns out another km of riding screwed the BB to the point that the chainring started rubbing the paint off the stay, so not ideal.. had to walk the bike back some ways after that! On the bright side I've figured out how to get the cranks off, but on the darker side the BB shells absolutely refuse to budge. Held the tool in with my the crankarm bolt and my 15mm spanner wedged in there, stepped on the HS spanner to give it a go and as expected it started to give, though I got a fair amount of force through it before that happened. Tried an adjustable with an 8in (or so) handle and stepping on that too, no dice. Have now bought a Silverline 32mm which arrives in two days, but am worrying that that won't be enough either. No idea where I could get a piece of pipe that would fit around that either (given as they come double-ended!). Am pretty close to bringing in to the LBS but I feel indignant that the last time I did that the replacement BB lasted me all of a year..
youClown
Update on BB replacement - I have now procured the BB tool and crank extractor, only to run into the issue of 'the damned cranks aren't coming out'. Can get the wrench to turn ever so slightly by getting the wrench and crankarm in a V and pushing them together but ran out of time on the first try and gave up to try again this evening.
Has made me wonder if my dinky 8inch 15mm spanner (I lack a torque wrench) might not give me the torque needed to get the cranks out (I have a slightly longer 32mm headset spanner that I am planning to use on the BB tool, but I have heard BB cups need even more torque..), and am equally worried about reinstallation of the cranks and torquing them to the right spec.. Has me wondering if I really should just have brought this to the LBS!
Lastly, if I rode the bike to work, would it damage the bike to tighten everything back up, take it on a 20 or so km commute home with a potentially knackered BB (not yet diagnosed if it's because bearings are knackered or maybe if it's because BB has come loose after a year, all I know is that there's side to side play)? Other option is to fix it here (have brought the tools in with me)..