This modification moves the front seat forward/aft adjustment from the side of the seat frame to in front of the seat cushion.  The process involves removing the pin holding the "T" handle and removing the handle from the side adjustment mechanism.  Drilling a pivot hole on the seat frame and installing the side adjustment lever.
Download Drawings and installation manual of original style seat levers (zipped file)
Seat Lever

Seat Lever

side view installed

side view installed

top view installed

top view installed

seat lever drawing

seat lever drawing

Solid Aluminum levers used in my aircraft.