Locking hinge between the top and bottom frame

Frame
1

I’m trying to mount the x4 on a skycruiser trike. While doing that I realized that the hinge between the top and the bottom is not locked and can move with some weight/pressure

To sit in the harness in the trike the pilots weight starts bending the top frame forward

I can’t figure out if there is any built in mechanism to lock the hinge. Do I need to stick some pins n the holes that I see in the picture attached? Or is there something built in that I’m not seeing

image
image3024×4032 3.41 MB

2

If you can’t find matching holes, the hinge pieces can be turned 180 the other way. You could figure out a pin to go in there or drill it to suit where you need it. There are also 3d printable hinge stops (check Gliderpilot’s build) you can make.