OK ,here are some pics of the" lap counting rig" that I designed and fabricated.
It really is pretty much the same old stuff with a couple of improvements.
I used vinyl to show high and low colors on the cards to duplicate the layout on
the light boxes at one.

Picture #1 This card is put out first so the callers can ident. their scorer.
#2 Cards 1-10..........high/low red & green.
#3 I included an eleventh card to make sure that lap was flown and scored.
#4 I only put a "cut out" card because we have cut lights at one.
#5 The back of each card shows the scorer the next lap, and high/low red
or green as a reminder.
#6 The stainless rings are held in a clamp block assy.
The rest are just shots of how it assembles etc,etc,etc..........
Everything is alum. and stainless with stainless and brass hardware.
The vinyl is (7) year stuff so I figure we will all be dead before this thing dies........
(that is unless somebody gets drunk and backs over the thing in the pits)

John Gibson