I found an old reference from Steve Curtin. It looks like an H.H. Smith Model 1458 will fit a 1/4" hole. Interchangable from 1/8" and banana connectors, same size hole. I haven't tried it myself. At Allied (http://www.alliedelec.com) Part numbers are 920-1490 for Red 920-1491 for Black
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Possible part number for 1/4" MH banana jacks
2004-04-28 by grantrichter2001