Peter Parry wrote:

Unless you have tried really hard there is a good chance there are
[snip]

Well time to swallow my pride then. I sorted it last night, I purchased
one hacksaw to attempt the screwdriver trick, but as I was in the
hardware shop I absent mindedly thought I'd buy a *proper* set of allen
keys too.

Guess what; the proper 3mm sized allen key worked first time after all.
So my problem all along was using the wrong size key blind due to
wanting to get the job done quickly.

As I said before, it's all part of _the learning experience_

Dan