...a Important Correction!
Earlier I stated 'the 1/4-20 Machine screws will thread into the Support Beams, a Min. of 0.240" ', Wrong! The Correct Thread Depth is a Min. of 0.450"- 0.460", Into the 0.500" 'High' Aluminum Bar, for a Secure Mount in a 'Blind' Hole.
Thank You