I'm looking for port plugs for my Marty Cubes and my eD a5-350s. Would need a couple for some 4" diameter round ports and slot ported shaped plugs. Anyone know how to either make some, or buy some premade? What's the best material to use, that's not too expensive?
I bought some open cell poly foam from Home Depot a couple inches larger than the height of the slot. I cut it a couple inches wider and about 6" deep, so I could squish it down and really stuff it in. It worked great.