Sorry if something similar was previously submitted. It's new to me (original thought even) Sometimes, clecos get in the way; think match marking butt splice edges when skins intentionally left "long" for fit-up.These super cheap pull rivets work well. All aluminum including the stem so they drill out super easy when done. The "dome" heads pull pretty flat so their probably the only ones needed. Certainly worth having a stash for build circumstances most haven't encountered yet. It certainly cut down the iterations required with making a tight butt joint. Just a thought. Best of luck.