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Heavy duty velcro in the trunk. Lay it down during normal use and it won't roll around and stick it to the side oduring a car show. The velcro sticks to the carpet fairly well.
I purchased the Brey-Krause seat mount that came with the quick-release bracket. I originally installed the mount/extinguisher in front of the passenger seat, however the wife hated having it mounted there as she felt it got in the way, especially on long cruises.
As a result, I remounted it in the trunk (convertible) directly onto my partition. I used the same basic hardware that was included with the Brey-Krauise seat mount, minus the bar, however I had to use longer bolts to fasten the aluminum mount through my partition. I then used a set of 4 large SS washers for additional support on the inside. Solid as a rock!
I've saved others cars and property. I'm glad I have never needed it for my stuff but it is worth saving others.
I started carrying mine after witnessing a club member's mint 63' vert get saved by another club member who was packing a fire extinguisher. Insurance or not, that would have been a tough one to lose.
I like knowing it's (mounted) in the trunk in case I need it.