On 25/02/2021 18:51, alan_m wrote:
On 25/02/2021 18:28, Tim+ wrote:
I cant believe that a designer decided that 9 mm would be too weak and
that a 10mm would be too cramped for space.

A layer of rust making a 9mm bolt oversize


The standard dodge is to use the larger spanner and then to fill the
gap with the tapered end od a large flat screwdriver.