I have taken the arm apart and removed the spring and drilled a new hole in the metal where one end of the spring attaches. This results in less tension on the windshield.
The spring which they put in these aftermarket wiper arms are not up to specs. Too strong or just a tad too short.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission