A note just in case some may have missed it (and Matt may be talking about something more advanced) but I understand from CARF that the Impacts being shipped from now on do have reinforcement formers in the tail.

For those with models without these formers, the new instruction manual released a few weeks back has the plan for the formers as an addendum. They are not dissimilar to those in the ZN lIne models around the stab/fin area, and don't (as far as I can tell) include formers further up the fuz as Matt suggests. I agree with Matt in that formers further up the fuz to prevent any deformation under load would help strengthen the structure further. I guess the issue still comes back to weight.