Search for "BZTS tubes homemade" and you will find a lot of results. I tried them for 4x5 and found they worked well. I used grey pvc electrical conduit for my set. I think the originals are welding rod holders.So getting anything beyond trays did not make sense to me, until xkaes mentioned tubes, which (yay! -- and I'm not being sarcastic) gives me something else to explore; Can anyone give me some links to more on them?
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