The WD-409 tail spring weldment on my Quick Build fuselage is not fitting very well.
Having to shim the WD-409 seems to be a common solution to having a gap between the bulkheads and the weldment.
My fit problem doesn't seem to be able to be fixed with a shim (maybe).
What I'm seeing is that the F-712 aft most bulkhead is concave.
The weldment flange fits up hard against the aft bulkhead in the center of the flange but there is a significant gap on either side of center. I checked the flatness of the F-712 bulkhead with a straightedge and sure enough, its off by the same amount as the gaps.
I suppose I could remove the bulkhead and try and flatten it out somehow and then add a shim.
Any thoughts would be appreciated.
Here's a photo of the situation:
Having to shim the WD-409 seems to be a common solution to having a gap between the bulkheads and the weldment.
My fit problem doesn't seem to be able to be fixed with a shim (maybe).
What I'm seeing is that the F-712 aft most bulkhead is concave.
The weldment flange fits up hard against the aft bulkhead in the center of the flange but there is a significant gap on either side of center. I checked the flatness of the F-712 bulkhead with a straightedge and sure enough, its off by the same amount as the gaps.
I suppose I could remove the bulkhead and try and flatten it out somehow and then add a shim.
Any thoughts would be appreciated.
Here's a photo of the situation: