Howdy. A while back someone suggested nicking a slit
in the Vanagon rasdiator bleed screw.
I recently ground a narrow, short kerf with my Dremel
and a miniature cutoff wheel.
This allows a pathway to bleed air and bubbles from
the coolant without completely removing the screw.
I left enough of the capscrew  thread intact to  form
a good seal when snugged down.
Now if I could braze on a knurled thumbwheel....
Not as elegant as the KEP bleed valve/recovery system,
but certainly cost-effective.  George

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