Don't know - I got my stubby over the weekend, and used a wrench cushioned with a work glove I had - and it still put two small marks on the original antenna, from the force/pressure of the wrench.
Learned two things - the original antenna is on there tightly, and that the metal/finish isn't very durable.
(FWIW, the stubby I got, "J" series, seems to work fine, even when not extended!)
Enjoying a BRAZEN Mid-life Crisis!
2008 BRAZEN GXP