Adapt a Manfrotto 504 to use Arca-type mount?

[mabou]

Hi all,

 

I have been adapting all of my photo and video gear to use Arca mounting systems for years. I recently purchased a Manfrotto 504 head and found out (the hard way) that none of the Arca adapter clamps will work with the 504 The reason is that the top of the 504 head is large, flat, and nearly flush with the top of the Manfrotto plate. So this does not allow enough room for the Arca clamp's knob.

 

I realize this is a fairly niche question, but does anyone have any knowledge of an Arca compatible clamp that will mount onto a flush surface (like the big, flat head on the 504)?

 

Thanks,

Matt