My Seraph host finally made it.
No for folks who are using one of those for their 4K4L and do not have a "big spring" from a P60 or similar one of those Malkoff Scout head adapter rings between lens and drop in pushes the drop in far enough back to make it work without the big spring. And it really doesn't block any of the beam.
A 26mm plumber o'ring will work too. A #22 o'ring should work. (1" ID, 1-1/8" OD, 1/16" thick) (26mm is 1.0236 inches or 1-59/2500 inch)