I reviewed the very helpful thread begun in 2012 about the internals of subject swamp coolers. I'm trying to revive a cooler, but in past it was clearly modified to run with some variety of 6V motor. I'm trying to find out what the internal original spring looks like and how it was arranged, as well as how the original cord was fastened inside the tumbler/drum. Any photos or comments showing this detail would be greatly appreciated. The photo posted is subject cooler. Thanks.