here is a service manual I found for the UK 29 radio. it shows the layout of the parts and is hard to read. maybe you can blow it up enough to read the parts. I looked at the alignment and it does not show L308 for align. parts layout shows it to be a coil spring. so you would leave it alone.
https://downloads.cobra.com/CB/Models/29-SERIES/UK_29_LTD_ST/UK29LTDST_service_manual.pdf
https://downloads.cobra.com/CB/Models/29-SERIES/UK_29_LTD_ST/UK29LTDST_service_manual.pdf