The hole thingy is cool and all, but only for single ply heads. If you have something like an Emperor batter, good luck.
Why would it not work for a 2 ply?
It will work on a 2ply, those blades are sharp.
It gets on your fingers. I`m not opposed to it just think single ply is a better port because you don`t need a port ring if you don`t want one.
The 2ply goes dead quicker. Specially if MM is in there. That`s why I did it.
I`ve never had a coated BD reso.
The myth of oil between the layers of some drum heads like Emperor seems to come from a misinterpretation of Newton's rings or Moiré patterns appearing because of optical interference between the two layers on clear heads. It's just optical physics folks.
Then there are the Evans hydraulics in Black and Red which are supposed to have oil.
Their web site suggests the Hydraulics Clear don't have the oil. Is that really the case?
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