Scrolling Mech Parts?

I was under the impression you couldn't scroll the Mech parts, yet when I was browsing through the FM last night I found 3 pieces that were +1. I saw no real big difference in stats, it just seemed to have a +1 there. The only thing I could think of is a Chaos Scroll, but I can't imagine people wasting them on the parts (plus the Attack/DEX/STR were all within range of what they drop from mobs at).

Does anyone know how you scroll them?