It isn't a big deal, as I've found a source right near my house in an RC hobby shop. I went to a home depot in Kamloops as well as one in Coquitlam, and both didn't stock anything smaller than #6. The guy working that area didn't have any thoughts on where to get them. With the ones from Cambodian Tire, the bike just bogged, and I could barely get rolling. I tried both one and two shims, and it was slightly better with just one. The symptoms are similar to those described when people used 4mm washers instead of 3mm ones.
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