Such a stupid problem I'm almost too embarrassed t

.....my new (to me anyway, it's very old) Celestron 8" SCT needs collimating, what with USA to UK shipping etc.

Problem: None of my allen keys, imperial OR metric, fit the collimation screws. HEEEEELP!!! (I did look close to see if the hex holes been bashed or bent, they haven't)

/goes off to look for a blushing smiley