Get a high school student who has done design.
With the broken part they should be able to draw up a replica.
I used free software (tinkercad) to design mine.
My local library has a 3D printer where I printed it.
The library won't print firearm components so I was printing a finger guard (nod nod wink wind say no more).
I was even asked to demo the "finger guards" to my local Mens Shed.
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