[markeb01]

Oops, one other important update I forgot about. The springs in the NOS wiper arms were so weak (5 ounces) the wipers flapped all over the glass at any speed above 50 mph. So I rebuilt the whole wiper transmission assembly with late (larger) spindles to hold newer blades. After days of work, the whole system failed, and the passenger arm and blade departed the vehicle!

So I reworked everything again back to mint/stock, and reinstalled the OEM wiper arms after replacing the internal tension springs with a brand new pair for a 69 Chevelle. They fit perfectly, and increased the tension against the glass to 10 ounces, which holds them in place perfectly, but they still sweep like they are supposed to!

It turns out the arms are supposed to have 1 ounce of tension for every one inch of arm length. The arms are 12" long, but ten ounces turned out to be perfect!!