Excellent. That all sounds very clear.

I make it about 20 mls that'll be required for a 50 mm section of 11 mm radius (without discounting the T nut and straw volume). Allowing 1.5 g/cm3 for the density of epoxy, a 2x28 g pack should easily do it, for a grand total of 7 euros. So that's 40 dollars of Trek's money that's heading to charity. Any nominations?