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No idea what tool i need.
Pin spanner? Screw driver? A key even?
Any help appreciated.
Is that just a plastic cover for a sq. taper?
APF
Yup.
Use anything within reason to unscrew the cap (flat blade screwdriver, end of a cone spanner, small coin, etc etc), a 14mm socket to remove the crank bolt, then a crank extractor tool to remove the crank from the square tapered axle.
Grand thank you. Was very worried as I'd agreed to have a look at the creaky bottom bracket in return for curry, one thing to admit defeat, quite another to turn down a takeaway.
For long term fix. Replace what ever tat is in there with a Shimano un55 bottom bracket
Once the cranks are off just measure the shell width and the axle length
