[kb2vxa]

Just be careful or you may be left with a hole to plug. What I'd rather is you obtain a proper mount, preferably the common NMO and install it, then you can tell us what you found with no real damage done. If you mess up the old mount no matter, in the end you're going to toss it anyway being it's next to useless. If you want to use an ASP antenna, like I said they had NMO adapter kits and many you'll find kicking around have already been adapted, all you'll need is the chrome plated ferrule part of the kit and they're around too.