windshield wiper mounting
 

1929 Cabriolet windshield wiper is ready to go on, but how?? there are two small holes that line up with tabs on wiper, Which is electric...then three large holes, one of which I assume is where wires enter header?? do not know what other two holes are for, other than let in rain?? And my wiper does not use off/on switch through one of holes?? would love to post pictures but can't seem to accomplish that task...