There are PETG ones out there that are the right OD (1") and ID (.144"). Anybody have a source for zinc plated steel ones? All the ones I find have too big of a ID. They kind of work, but drilled for a #6 thread would be much more desirable. I got a quote from a company to have some made. Price gets pretty decent at 5000 pieces. That's a lot of shop outs.