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So I bought a 1/2" sliding t-bar and some hex bits, and it's still not budging at all. The bolt isn't rounded off, but it's obviously resisted quite a bit of pressure so far and the hex bit is slipping before the pedal moves.
Should I try again with some of the Chill Zone stuff? Or is there anything else I could try?
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Slipping as in it's climbing out of the recess in the pedal?
You could try some plumbers freeze spray on the pedal axle, sometimes that's enough to reduce the force required to overcome the friction between the two parts (by shrinking the axle relative to the crank).
Otherwise what I'd do is to clamp the hex bit into the pedal recess using a vice so there is absolutely no way it can come out, then use something (ring end spanner round the hex bit with extension bar over spanner) to turn the hex bit.
½" square drive sliding T-handle. If your sockets are ⅜" or ¼", get an adapter too rather than a smaller T-handle, then you'll always have the big drive for any future big jobs. If you ask in a decent shop they should have one, or buy from any of the many online shops, e.g.
CK https://www.google.co.uk/shopping/product/16680909376791418226
Bahco https://www.google.co.uk/shopping/product/6205347809945622394
Silverline https://www.google.co.uk/shopping/product/7478881141934360818
Draper https://www.google.co.uk/shopping/product/4997607343275404112