Many people (and vendors) call the button/switch on the top of a mechanical (foot-start) starter a mechanical starter-solenoid.

You obviously (from your photo) have an electrical solenoid that was used on many (if not all) Powerglide-equipped 235 (6v and 12v) car engines, and Hydra-Matic-equipped 235 (6v and 12v) truck engines, and optionally on 12v 55-59 235 and 261 truck engines (it may have been standard on later 261s?).

Tiny's solution for using a mechanical solenoid on your 12v solenoid-equipped starter sounds good, assuming that foot-lever set-up will attach to the lever that actuates the starter-drive (Bendix) mechanism inside the starter "nose". I have never done this, but most likely Tiny has.

If you want a 6v starting system, your could use a 6v flywheel/clutch-assembly and foot-start linkage-mechanism and starter (as ttodd posted).

An aside: I have always wondered if the term "foot- stomp starter" was invented by people who have only used foot-actuated starters that had worn out mechanical solenoids. Stomping on one of these starter buttons that is good condition would seem to be unnecessarily violent and unduly inelegant (even in a truck). grin

Tim