[BobbyLucas]

Are we really meant to use -4 rivets here? Seems like a pretty important component and the shop heads fail both diameter and height.

 

[rvbuilder2002]

Actual shop head size requirements details in this doc

https://www.vansaircraft.com/faq/mi...pec-rivets-buck-type-preparation-and-install/

Other info and explanations are in Section 5 of build manual.

 

[BobbyLucas]

Just checked and my shop heads meet the min diameter spec by about 3 thou and the min thickness spec by about 8 thou. Thanks Scott!

 

[PaulvS]

Minor variations

There can be minor variations in the kit/build and it is quite OK to use a longer rivet to achieve the correct size shop head. I always check that the tail protrusion is adequate i.e. 1.5 times rivet diameter, before setting. And it must not be too long either, to avoid clinching (bending over).