DeWalt DWOAS5BC Dewalt Brush Attachment - Quantity 1

I recently purchased a set of Dewalt Battery tools for the yard. I got the DCST972X1 that came with a string trimmer (i will do it separately, but it is top notch as well) and added on a brush cutter attachment. I own a Stihl power head, but unfortunately the brush head got borrowed and never returned. I say that just to be clear i have used gas powered brush cutters. This will cut through most anything you would be using a brush cutter for. I saw some say it wouldn't cut through a 1/4 inch sapling, but that is entirely false. Sure, if you just push it into a sapling, you will likely get it caught and stop the tool dead. Get it spinning and swing at it like you would a golf club; swing through it. I was definitely cutting stuff that would be outside the recommended diameter with little trouble. With the (DCST972X1 included) 9ah battery, I found that I was able to do quite a lot of work while only draining the battery to 2/3 charge. The one thing outside of the norm that I experienced quickly with the tool was that if you encountered something that stopped the blade, the tool will spin at the connection. It uses a metal button in a hole to "lock" the tool in position and you screw down the wing bolt. However this is not enough to stop it from rotating when the blade is suddenly stopped. (i had that bolt as tight as i could get it) Part of me thinks this may actually save the tool in the long run by 'softening the blow' of a hard stop like that. It does not seem to have damaged the power head or the tool in any way I can see. However it does cause you to have to stop, loosen the wing bolt and rotate the tool back into position. Once you find out what it will and wont cut, as well as your technique for operating the tool, it happens less and less. (though i would be interested to hear from Dewalt on that issue) Finally. Included in the brush cutter kit is the crooked metal bar. (it's in the last picture) What in the heck is that? It is not mentioned anywhere in the documentation. It does not appear to be a tool of any sort, the ends are rounded. What is it's purpose?

I purchased the DCST970 which is a 15' brushless string trimmer instead of the DCST972 model because it was cheaper. This brush cutter attachment says its universal so I assumed given the term "universal" means it will work for all that it would work for my model. However it is not universal as the brush cutter attachment only works for the DCST972 model. The trimmer works great, I have no complaints, but the term universal is misleading to the purchaser is they want to make use of the attachments.