Been looking at some 021's on ebay, and I've noticed some of them have the decal which shows the (H) and (L) for the carburetor adjustment screws, but some of them only show the (L) and it looks from the pics that the hole for the (H) is either not there or perhaps blocked off. Did Stihl at some point change the design on this model, and eliminate the (High) adjustment capability for some EPA crap or what?