[R-390] Bristol set screws

[Bernard nicholson]

Chris   The bristo  set screws are used on most Collins radio gear that I have come across, the ART13 uses them from WW2  , their advantage is that they have an increased surface area when compared with an Allen Screw, and consequently can be tightened to a higher tension ,  changing them all at your radio site to standardize  , would eventually create great confusion once the radio passed on to  a new owner  which they all eventually will, it would also take away from its value for the purist collector , in my view  it would be an act of sacrilege even an act of apostasy?  regards Bernie Vk2abn