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« Last post by Bigsmoke on November 08, 2025, 11:32:56 AM »
Interesting, Jim. I had never thought of using a sheet of yellow legal paper for a background before.
FWIW, in years gone by when I used to make a lot of those valved priming horns, I kept one valve tip as a guide.
I would install a good one in the tip and after the epoxy had set up, I would take the working parts out and then screw in the old tip. Then I would sand down to that, producing a tapered horn tip that followed the exact size of the screw in end.
I also had a set of numbered drill bits and I would open the hole in the screw in tip one drill size larger and I would polish the plunger and make sure the vent at the bottom was free of any burrs.
It was a PITA, but it made the horn work so much more smoothly.
I also kept a supply of replacement parts (especially springs) in case something got lost in the manufacturing process.
John