Singer 368 Fashion - I need advice on replacing shaft gears?

Hi everyone,

I need help with replacing shaft gears on my Singer 368 Fashion sewing machine.

I got it recently, and after a few fine works, the gears broke (I understood it is common with old plastic). I managed to disassemble most of it, but I have a problem with the horizontal gear. Here are photos on my blog with explanation: https://sasarudan.com/en/singer-368/

Thanks a lot,
Sasha