Hi Chris
I am in Saskatoon, Saskatchewan, Canada.
Tool arrived in nice envelope, gift, toy so no unexpected charges.
Don't Hammer on your radio!
I briefly tried that nut with two small screwdrivers and a pair of vise grips, not the way to go, damaged the nut just a little on one slot, scraped a little, so didn't proceed.
When you get the tool, you might notice that the face to bore is a little out of whack, but there is just the right amount of clearance to go over the sma thread. Make sure the pokey downy things are engaged as best a possible give it just a small twist to the right to break it loose just a little then proceed to undo it. There is nothing really interesting to see inside when you do the mod, everything is sealed up real well.
Wanna go 1/2 rs on the service manual? I can scan or you.
I just picked up this radio to evaluate for a guy who runs a flying service up North. He has been running modded Icom 02At's for years. Uses them in the aircraft all the time, looks like I'm running low on words here, Mike