GTech CLM021 Lawnmower - Lower Handles. Qn. Have the squares on your handles rounded off and the locking bolts will not tighten. If so then replacing with these handles will solve your problem.
GTech CLM021 Lawnmower - Grass box flap
GTech CLM021 Lawnmower - Lower Handles
GTech CLM021 Lawnmower - Top Handle with Fixings
Gtech Cordless Lawnmower CLM021 - starting bar
GTech Cordless Lawnmower CLM021 - Front Axle