So I've seen lots of pictures of the Slickstart Boosters mounted on the upper portion of the firewall and was wondering if people are adding doublers behind them, bolting them directly, or adding nutplates behind them?
I just bolted mine on -- no doubler or nutplates (although nutplates aren't a bad idea). However, the only reason to ever take it off once installed is to replace a failed unit.
I used a doubler. The unit is mounted only by the tab on the bottom, so the rest of it is cantilevered from there, I'd be afraid it would eventually pull through the thin stainless without a doubler.
I added a piece of closed cell insulating foam berween the fire wall and the unsupported end of the Slick start module so that it wouldn?t vibrate. Its been fine for 3 years.
I used large washers behind the firewall and fabricated an additional bracket. I was not happy with the just attaching it at the bottom with the firewall being so thin.
Thanks for all the feedback, I added a doubler with nutplates for now. I'll see how much it actually moves and vibrates if I ever get to an engine start.