Is there a DPDT toggle for OBEL bypass that will fit in an existing 3/8 pot hole?
Yes, they are available. The thing is that they are big.
http://rover.ebay.com/rover/1/711-53200 ... =824&kw=lg
You could try putting a slightly larger washer (that will not go thru the hole) under the washer that comes with the mini toggle. Then the nut.