I worked with Brian at SwayAway, they have torsion bars for the FlipPac.... AND now hinge kits. The new kits are way beefier and will eliminate all those pesky shims, here are some links to the parts you may need:
Sway-A-Way hinge kit
Sway-A-Way torsion bar
Hope this helps!
Just fyi to all the questions about the mold. The mold is what is used to manufacture the tops. The company making these (East Coast Customs) stopped doing tops and I bought the last topper and the mold along with it. This would allow making more tops or even making some very custom inserts...
I am no longer considering this sale pending, the current interested party is 2000 miles away and reluctant to put down even a $100 deposit. SO.... first come first served.
I'm Still interested in selling the mold as well (both for $2500)