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I would respond to a radio check. There just aren’t many GMRS users yet in my area. Sent from my iPhone using Tapatalk

Liquid electrical tape would be what I would use. Gardner Bender 07315001126 LTB-400 Liquid Electrical Tape, Easy-on, Waterproof, Indoor/Outdoor Use, 4 Oz. Jar, Black, Bottle https://www.amazon.com/dp/B000FPAN2K/ref=cm_sw_r_cp_api_glt_fabc_X3G6JWQ2174DCBF19FZB

The sad-hams would come crawling out of the woodwork like moths to a bright light! ??

It is highly likely that those radios are actually 20KHz bandwidth, not 25. You'd have to be looking at radios well over 30 years old to see 25 KHz bandwidth. If the FCC Type Acceptance shows an emission code that is 16Kxxxxxx, it is 20KHz. Given the fuzzy response from the FCC, you may consider legacy 20KHz radios to be very usable in GMRS. I do. The narrowbanding effort that culminated on the the deadline of 1/1/13 brought most of Part 90 down to 12.5KHz, forcing a lot of agencies to remove their older 20KHz only radios from service which is why you see so many of them for sale on auction sites.