I will show you mine if you show me yours.
 

What are builders doing at this interference point? fwd top skin is binding against backing flange.

Get out the cutter
 

Scott,
I cut a slice out of the frame where the contact occurs. You can put MWH tape there but the slice worked fine on mine. On numerous RV4 pre-buys I have seen both approaches, more cuts than anything else.

Smokey

I just let it rub.

That is exactly the way mine looks, good question.

Ross Scroggs
RV-4 #3911
Locust Grove, GA

chaffing
 

we can call that a normal problem on the -4. mine does it too.
:rolleyes:

antichaffing tape slow the deterioration

cheer

Michel
C-GVFR

Trim off the bulkhead and forget about it. Unless you like screeching noises when you close the canopy.

Trim it carefully along the pre-scratched guidelines and you won't even have a noticeable gap or air leak.