
Screw UNC 1/4-20x3/4" (19 mm) universal
PV 444, PV 544, Amazon, 1800, 164
- Thread:
- 1/4"-20 UNC
- System:
- D-type overdrive
- Type:
- External hexagon
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Loose seats that slide in the rail, a tilt that won't stay put or a locking pin that has lost its spring are among the most common wear points in the front seat base on a 145. When a link screw runs stiff or a return spring has gone slack, both adjustment and locking become unreliable.

PV 444, PV 544, Amazon, 1800, 164

Duett, Amazon, 1800

PV 444, PV 544, Duett, Amazon, 1800, 164, 780, S90

PV 444, Duett, PV 544, Amazon, 1800, 164, 780, S90, S70, C70

PV 444, Duett, PV 544, Amazon, 1800, 164, 780, S90
PV 444, PV 544, Amazon, 1800, 140, 164
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This category gathers parts for the seat mechanism itself – not the seat as such. The group includes springs, screw, nut and washer, push button, locking pin, link screw and locking sleeve, that is the small details that control slide, lock and spring in the base.
A typical checkpoint during restoration is to replace tired springs and worn locking pins at the same time, so the seat clicks back into the correct position. Fits 145 in the BAS HT/NT version.