Early ones didn't have a slot. The slot was adopted later.
__________________ Carl N.
Arlington, WA (KAWO)
RV-8, 240 Tach Hours (Pic) - Out with the Old, In with the New (Pic)
RV-8, 1938 Tach Hours (Pic 1), (Pic 2), (Pic 3) - Sold
Glasflügel H-201B Standard Libelle, N564NS - Sold
Rolladen-Schneider LS1-f, N61MP - No longer owned