This document covers the procedure for fitting an Airmaster Lycoming slipring assembly to a Lycoming starter ringer gear (with large alternator pulley). Installers must complete this task before mounting the hub and ring gear to the engine flange.
The existence of the starter ring gear in Lycoming engines interferes with the normal position of the slipring normally located behind the spinner backplate. As a result, the slipring is mounted inside the starter ring gear, and a multi-component sensor-brush bracket assembly is required.
Lycoming Slipring Installation (Ring Gear) 
Lycoming Ring Gear Machining Drawing R2
