You can remove the belt that drives the gearbox at this point - if this has worn out then only the high speed attachment will have been working. It will lift off nicely with a screwdriver.
The large gear then needs to be gripped, and the "dog" on top of it needs to be removed.
You'll need to hold the gear in place (by holding the bit that grips the K attachment - get someone else to hold onto it tight) and turn the dog with a spanner. Eventually the person holding will feel it release, and you can unscrew the final turn carefully so the spring doesn't fly off!
Apologies for the cake/belt continuity errors in this set - some are taken during reassembly
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