Hey there! I will respond on facebook, too, but I wanted to let you know that I don't think I will be able to help with this, at this time. I don't have any knowledge on how to make/clean belt holes in a buckle collar yet. If you wanted to be a little bit of test dummy for something like this and didn't mind a minorly flawed product, I would be interested in selling you some for the cost of shipping. Feel free to message me on facebook if it interests you!
I ordered 2 limited slip biothanes, with matching leashes and they came in the mail this week. I'll be honest, when I first (ripped) opened the package (standing outside in the cold and dark), I wasn't super thrilled with the texture and feel of the biothane. It felt rough and stiff in my hands, but I knew that it had been in the mailbox for several hours and it was in the single digits all day, so they were all probably a little frozen. I brought them all inside and set them on the table, when i grabbed the tracking line to take Hudson out, it had soften way up and I think it feels the same, or at least very similar to my All-K9 biothane leads.