Here’s a basic yoyo design with C guts:
https://drive.google.com/drive/folders/1m4j5lLO96FMvKGKCzjBe5wUka1Vbwivu?usp=sharing
C bearing
56x42mm
4.4mm gap
10mm m4 axle
Each half should weigh about 31.16g before assembly, the assembled weight would be around 65g or so depending on the parts.
