Well, right you are. I actually have two group 27 batteries and it is a tight squeeze- but I'm always a bit concerned about the bounce (or the possibility of a bounce). Anyway- I DID locate something at an auto parts store that looks like it will work quite well except for having to enlarge the holes at the bottom of the box just a hair- which will involve laying or kneeling on my back in the snow to do it but not much to overcome given the motivation of somebody trying to head south.
. I actually stopped by the old hi-lo dealer to see if they had any laying around but they did not. The guy there said he used to twist them off all the time, though, and also suggested the auto-tied down solution.
Thanks for getting back.
Rick