He could use MRII 5124 and "machine the end to fit the engine. plug the end with a wood plug then find the center. then using the inner size of a holesaw to match the inside of the engine. cutting the flange off the leaving end to mate the horn to the engine.
I hope this makes sense.
Sonic Barbarian
Yeah, folks nowadays are 3D printing all kinds of custom horns, adapters, face-plates, even whole Danley Synergy Concept horns on DIYA.
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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