The RV-12 instructions for assembing the roll bar states to machine counter-sink the top roll bar rivet holes for CS4-4 rivets. No mention is made about this counter-sink being 100 deg or 120 deg. Should I ALWAYS use 120 deg for CS-4 rivets? I remember some places in the wing construction where it DID specify 120 deg for the counter-sink for some CS4 rivets.
Thanks in advance for any help.
JimMac
Thanks in advance for any help.
JimMac