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I can't remember off-hand if they are designed to have a hole in th etop, but probably so. The question is, how much noise will that generate? I am a little skeptical of the design just for the clogging issue, but so far I haven't heard of anyone having them do so. Easy to change out and experiment with anyway, so don't sweat it.
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Jonathan--DIBS Breeder and Card carrying member of the Square Skimmer Brigade
(Click on the Red House to see my pics garage)
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