Televue Gibraltar leg extension lock knobs

[moriniboy]

Hi

Can anyone confirm the imperial size used by TV for these knobs

All other items on the tripod seem to be 1/4"-20

The previous owner seems to have lost the originals and replaced with hex bolts, see attached next to a mount foot spike for scale.

[Peter Drew]

!/4" UNC and 3/8 UNC have the same thread pitch as 1/4" Whit and 3/8" Whit, the difference lies in the thread angle, UNC is 60 degrees and Whit is 55 degrees. NB, 1/2" UNC and 1/2" Whit are different pitch. 

[moriniboy]

Thank the heavens for metrication!