Tower Gaskets

I been having a problem with my gaskets under the base of my tower spinning out from under the base. Had issues last year and got them all replaced at the beginning of the year this year. No after about 115 hrs the gasket on the back left has spun almost all the way out again. Anyone had this problem and know how to prevent it?

Is it hard? safe? to remove the tower screws and replace the gaskets myself or should i have the dealer do it again?

ordered some from my dealer.. replaced them... not that much trouble..
here is the culprit..screws / bolts on underside vibrate loose.. get a second nut and tighten it on top of the first nut!

I ddint' and my new ones have slipped again!! UGH!