The folks with a digital camera should take a picture of this:
Fist on bottom wrench in the "Fonzie" position, but with the pinkie hooked underneath to hold the wrench.
Top wrench hooked under thumb.
Middle wrench in other hand to loosen jamb nut.

Leathermang's top wrenches with the long handles work best with this technique.

To make the bottom wrench I cut the opening in the box wrench, rebent the angle, then welded the top plate after cutting the slot in it. Cut and fit, bend and fit, weld and fit. The box was too thick so I ground it thinner. THEN I figured out I needed a foot on it for leverage. Made and welded the foot. Rebent the angle. If time was money... NOW I see the HAZET wrench has a sliding foot. Where were you folks 20 years ago ??!!

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daBenz - 1970 220D