I just finished a New Haven oak kitchen clock (my job no. 4333). The movement has 4 pillars and the dimensions are 4-9/16 x 3-1/4. The time mainspring is held by a separate short pillar attached to back plate. This movement has thin springs for time and strike. The two springs are both old but they are different, so I don’t know which one (if any) is original. The spring thicknesses are:
Time: 0.0165 inch
Strike: 0.0160 inch
This clock has nice old thin springs, and the pendulum motion is good, and so is the striking speed.
For future reference, some of the pivot diameters are:
T5F: 1.2 mm
T4F: 1.2 mm
T3F: 1.2 mm
T2F: 1.55 mm
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