I was planing on fitting a OEM Shark GPS/Aireal Antennae this Bank Holiday Weekend .
When I realized that I didn't have the hexagon nut in the ETKA picture you see below.
I've asked a couple of people I know if they have anything something similar that would fit round these fine grooves as it looks like these twirl grooves are very close together.
Picture below :
Can anybody advise where I can get a similar nut to fit ? Or maybe a alternative way to secure this shark aerial down ?