I have a Goya 174, a Goya 163, a Levin LT-18 and a Levin W-36. All originally with threaded plastic adjustable saddles.
The Levin W-36 was the one I made bone replacements for on the pictures You probably saw. The Goya 174 has since been equipped with another set. The Goya 163 has its original plastic saddles and the Levin LT-18 has had the entire bridge replaced, and I chose to conver that to a traditional one piece bone saddle, with careful compensation for intonation.
I do have a couple of leftover sets of plastic saddle screws but hesitate to sell them.
My recommendation for You is to try visiting a mechanical workshop and have them make You a piece of threaded brass rod, and cut it in pieces Yourself. It is possible to shape the top to the original shape with a fine file.
Making them in bone was rather difficult due to the fragile nature of bone.
The thread is M8 X 0,75, meaning 8 mm outer diameter with 0,75 mm movement per rotation. It is considered a "fine thread", or "fin-gaenga" in Swedish".
Don´t hesitate to ask me questions.
One alternative would be to contact a proffessional luthier or repairman to convert Your bridge for a traditional saddle. Basically You route a wide slot along the existing screw-saddles and fill it with a piece of rosewood and make a new slot.
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