Water Rocket Fin Bracket

So the springs here, we all love water rockets, and i needed a fin assembly for my large rocket. nothing here had 4 fin brackets that i could find, so i designed this for you all.
fits a 98mm Outer diameter bottle, scale up or down as you wish, it can be tricky to get the perfect fit! :-)
Please use nylon bolts or screws when assembling your fin bracket, bottles under pressure mixed with metal is not a good nor safe combo!!

The holes are made about 1mm in diameter for the screws, feel free to drill them to your exact specifications ;-)

Did i mention that if you print two of theese 4 part assemblys, you will have a very good fin system for even a large rocket.
They are designed with splines to be self aligning.

Have FUN!