Archie wrote:

There are tubing cutters [notcher?] advertised regularly in Sport Aviation.

They

claim

high precision and good performance on 4130.

I purchased two from Harbor Frt,
and one from Dale Wilch.(premium model).
The Dale Wilch performed much better,
and was 5 times the price.
For acute angles, one of my Bridgeports
works best.
Archie

 
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