I talked to Danny about this the other day. I'm getting ready to buy one of his blocks and was concerned about it.
If I understood correctly, he said that it was a problem with the taper of the barbs. Effectively immediately, he says the blocks are only going to ship with poly barbs if you've got the clear top. He says that he's currently working on getting some barbs custom made that shouldn't crack the tops. But that could be a little while.
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