I have Echo SRM-210, Echo SRM-2400, and an Echo SRM-261T straight-shaft weed-eaters. I was wondering if anyone knew what the max. size of trimmer line I could use on each of the trimmers listed above. I just purchased some .105 Gatorline and I want to make sure I can use it on all of these trimmers without putting undue stress on the weed-eaters. Thanks to anyone who sends a little information my way.