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Old 05-03-2021, 02:42 AM
JazzyJ JazzyJ is offline
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Join Date: Oct 2009
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Default Custom (Rubber/Silicone) Soundhole Cover / Feedback Buster?

Hi, is anyone aware of a place that can make custom feedback busters in rubber/silicone?

A regular 4" cover is too big for my Yairi DY75 so I'm looking for something smaller - and with a cut out for volume dial!

I really don't like the wooden designs from the likes of and (a bit medieval for me!) - I'm just looking for something plain and black like all of the regular ones that are available for standard 4" holes.

Perhaps it can be done with 3D printing nowadays?

Failing that, is it possible to 'sand off' an exisiting rubber one (by 2 or 3mm) to get it to fit?

Or is the reality for me a can of black paint, a CD, some hot water, a pair of scissors, a bit of foam and a glue gun my best option.......

Thanks for any suggestions or advice anyone can offer (apart from playing at a lower volume!).
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Old 05-03-2021, 07:34 AM
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Tim McKnight Tim McKnight is offline
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Location: Morral, Ohio
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If you are wanting to try a DYI, a balloon and margarine bowl lid will work, which is easily cut with scissors. I doubt you could sand the rubber cover to fit but you should be able to trim it with some HD scissors.
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Old 05-03-2021, 08:29 AM
tadol tadol is offline
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Location: Berkeley, CA
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Know anyone with a 3d printer?
More than a few Santa Cruz’s, a few Sexauers, a Patterson, a Larrivee, a Cumpiano, and a Klepper!!
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Old 05-03-2021, 08:37 AM
Alan Carruth Alan Carruth is offline
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Join Date: Feb 2011
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I've made sound hole covers using foam poster board and card stock. Cut the foam board to a snug fit, and then glue it to a larger disc of card stock to keep it from falling in. This is a jury rig for experimental purposes, of course, but you could readily adapt that to nicer materials such as wood, and cork, or felt, for gaskets.

The lute rose type of feedback buster works by adding drag to the air flow through the hole at the 'main air' resonant pitch, which is the usual problem. Having a network of holes that cover the entire span of the hole, with a lot of edges, is the key to cutting down the amplitude of the mode without altering it's pitch much. A piece of window screen or gauze stretched over a ring would be extremely effective. The 'inverted wedding cake' parchment roses are the paradigm.

If there's a maker space near you it might be possible to get somebody there to make one up on a laser cutter, or you could join and do it yourself.
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