Originally Posted by deanc338
How do you guys cut perfect circle holes for the wing pivot points?
I tried but it ended up with weird edges.
I'm sure there are more sophisticated ways but I just drew an exact circle, carefully cut inside the line and then carefully sanded the foam up to the line. You just need to be careful and wrap the sand paper round something round like a bit of dowel, or even a pencil. The 'fatter' the object you wrap the sandpapr round, the easier it will be to get it absoultely right. Another way would be to use a hole cutter of the correct diameter, or close to, and then sand as above. Could luck, just take it slowly, if you sand up to the circle you have drawn you can't really go wrong. I also used thin strips of cellophane round the pivot to take out any play and act as a kind of bearing. I'm sure there are other instructions in the build thread?