Here is a link to a 210ft roll of Kendama string I have. It is just like Sweets silk string the only problem is it is rainbow. https://www.amazon.com/RAINBOW-Bugt...r=8-1&keywords=rainbow+1mm+bugtail+satin+cord
That's approximately 168 restringings at 15inches or 38cm each, the industry standard. Buy some spinners in bulk too, and you can sell sets in dime bags at dama events
Amazon or eBay. Alicenter(TM) 20 PCS - F681xzz (1.5x4x2 mm) Flange Metal Double Shielded Ball Bearing https://www.amazon.com/dp/B01AG5PHOW/ref=cm_sw_r_cp_api_cSdGybN30DWSD Don't know about the flange. But the size you're looking for is 1.5x4x2mm.
I would put the flange against the tama hole and let the knot sit on the other side. Otherwise, I also found this seller. A little bit of reading led me to RC car parts. It makes sense because they have a tone of little parts to them.
Well here's 960ft that i bought. Feels like ozora string and kusa string had a baby https://www.amazon.com/dp/B00A4LMV1G/ref=cm_sw_r_cp_api_UxgWxb83RBVPC catch me outside how bout dat