Does anyone know where I can get a rubber hole plug made to fit in the
NMO mount hole?



During my career, I generally used Antenna Specialists rubber hole
plugs, Part No. ASP K35 for your application. I'd recommend just
plugging the hole and drilling a new one... not too close to the old one.
Also would recommend a little Silicone RTV on the hole plug before
installing. Do a Google search on the part for vendors, or you could
stop by a local commercial radio maintenance shop and ask if they would
sell you one.


Ed K7AAT