Reuse the preset that you punched out off the roll.
I have done this a few times but as a rookie I feel like I am shortCorrect, make sure the punch is dead center on the 2 rivet heads to not deform so bad that you can't get the side strap back on it.
You may need a small 4mm or smaller socket and a small hammer to get them mated together.
Then use the hammer to finish the rivets when the loop is joined.
Thank You Your reply is comforting ,, I will be careful to hit dead center on the rivet head. I have good luck with spinning the rivet using marvel mystery oil on die and rivet head with light pressure on the anvil to start.If you got a spinner that's got an anvil for .250 -.325 it will form a nice clean rivet head on that preset only smaller diameter
Most of my bike saw (wellbover 30hp) practice chains have reused presets to join up the loops.
Never broke a loop yet.
My last 100 foot roll of chain I reused half of the presets . Still got lots of new presets left over.
I did figure that out, but hopefully for hysterical sake, readers down the line will benefit.Lubricant is important when spinning. I use Slick 50 (the original formula) from the early '80s.
When you punch out those 2 rivets don't punch out one first. Punch them both equally back and forth until their free that way you won't bent the side strap and mushroom the rivets.