Well I got some glass tube today from North Carolina and while it was better it wasn't a perfect fit. Ideally you want to be able to drop the sight glass down from the top passing through the block fitting that holds it, but it was just a little too big in diameter. I had to slip it in while tightening the fittings. The sight glass goes in bottom fitting before it's completely tight then turn the fittings together to get it to slip into the top. If that makes sense ?
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I tried to post a photo but didn't have any luck..... I'll figure it out later.