[Hallicrafters] Spline key size for s-38c

[Alan Adelman]

I have 2 spline key sets (9 and 10 key) from McMaster-Carr.  Neither of these has a key which will fit the knobs on my S-38C, nor will any allen wrench come close enough.  Allegedly the 10 key set fits Halli and Collins.  If anybody would kindly let me know what size and number of flutes fits their S-38C, I would appreciate it.

Thanks -- Alan, wb2erj
aadelma at yahoo.com