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That's good news. In the shop you will probably find they don't have a 1/4inch x 5/8inch long. All the 1/4inch socket head cap screws I have seen state the length in mm - go figure!
So, 1/4inch x 5/8inch long would be 1/4inch x 16mm. Make sure you have a set of imperial allen keys too, as metric allen keys will not usually fit imperial socket head cap screws.
Cheers
Dennis
PS – ¼ x 20 UNC is the same as the 1/4 in Whitworth thread that most tripod heads use to screw your camera onto the mounting plate.
PPS – Are there any metallurgists out there who can advise on the effects of using a SS fastener on an Aluminium mirror cell? Will there be any adverse effects due to e.g. electrolysis?
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