How can I change a blade of a Flymo Comapct 300 Lawn Mower?

You're nor doing anything wrong - the bolt is just tight. You will need the correct size spanner to fit the bolt. In extremis, you can knock it round with a hammer and cold chisel on the corners, but you will destroy the bolt head in the process, and will need a new one for re-assembly.

Phil Saunders
March 2009

Strength in your upper arms?

pleasant
March 2009