Brute
Hooked
I should also note that I tried the Rotopax locking mount, but the locks don't last in the weather and become very difficult to open. The last time I removed the cylinders, it took me about 10 minutes to get then to open, so they were both tossed in the nearest garbage can and replaced with a 7 foot cable and a padlock that locks to my jack. I just looped the cable around the handles on the passenger side cans, ran the end through the gas can you see in the picture and hooked to the lock. When I carry the chainsaw, I loop the cable through the handle before it goes through the drivers side tank, which makes the chainsaw harder to steal as well. If the padlock fails, I can cut it off without much work...not so easy with the Rotopax lock fails. The cable and lock were also a lot less expensive than one Rotopax lock.
I've had to continually spray wd-40 into the rotopax locks to prevent them from jamming up as well...they are not made from the best quality steel...