Size of socket cap for Kona Impact headset

Fenland Dragon

Devout Dirtbag
Please can anyone help? My 1996 Kona Cindercone returned from a service at Halfords with a missing side socket cap screw at the side of the impact headset. I will not pursue them to replace it, it’s too much trouble than it’s worth.

Please could anyone advise what is the correct size screw, length thread etc so I could source one myself. I need this urgently as I am taking the bike to Cornwall on Sunday 24th July to ride the Camel Trial

Thanks Jim
 

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that looks like it's had the threads ripped out of it. repairable, but needs an insert.
it is most likely m5x1.0 20mm
 
Many Thanks for your help
I just took these pictures of the bolt from my 94 Cindy as they may help. Looks like it’s from the same headset. My headset is cracked so ignore that difference :) Best of luck.
 

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Greetings from Cornwall. Thanks all who helped. I ordered a M5 x 25 socket cap from AZ fasteners this was the incorrect size - too big. I was left panicking last Saturday trying to find a correct socket cap . I eventually found a M 2.5mm thread socket cap in one of my tool boxes which seems to fit. Camel Trial Wadebridge to Padstowe completed today. My wife is using the Cindercone and I am using the ‘98 Hahanna.
 

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