I ordered a batch of 18mm single-flange spring bars but to my dismay, they didn't fit. The seller accepts returns but I only paid about $5 and I don't want to go through the trouble of shipping all the way back to Australia.
The problem is that the body of the spring bar (that is, the length of the spring bar minus the ends) measures 18mm. The ends, when depressed, protrude from the body 1mm on each side. I'm going to order another batch but this time from Ofrei. Just to be sure, should I order the 18mm ones?