My apologies to the LBS. It wasn't that he head never seen chainring bolts etc, just he had not seen any like these.
The heads are hex like a regular bolt head. then a spacer then a "nut" that is round and sits in the hole of the 38. now that nut appears to have an allen socket in the center. I
t may not be Tourney it says "custom" on the crank arms. Photos to follow: