Adding weight to Speedmaker?

I got another speedmaker and I want to do some simple clean mods to it. I had this yoyo as my first yoyojam and it feels alot different now that i’ve been introduced into all these nice metals. This yoyo already plays pretty well but I was wondering how can I add weight? I found that weight rings are a good idea but I have no idea where to find them. Im aiming for an increase from 62 to 65 grams.

Hardware store - 3/16 thick o-rings. See what fits. There may be problems keeping them in unless you use caps.