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328d
Solid aluminum base. Sits flat on workbench. Steel preload pin. Steel threaded studs.
This sets the preload to 14MM. I have 1MM shims I can send you in order to set the preload to 13MM. 14MM was used on the early dome top pumps. 13MM was used on the square top pump.
328b
Solid aluminum base. Sits flat on workbench. Steel preload pin.
