MIL-R-8236F(1) - Reel, Shoulder Harness, Inertia Lock MIL8236F-1231588-Reel, Shoulder Harness, Inertia Lock-Document Status: Active. Information and documents presented here are works of the U.S. Government and ar MIL-R-8236F(1) - Reel, Shoulder Harness, Inertia Lock Inertia Reel | eBay Find great deals on eBay for Inertia Reel. Shop with confidence. Skip to main content. eBay Logo: American Seating Shoulder Harness Reel-Inertia Lock MA-2 20-2121-23L424 (19960) Pre-Owned. $95. or Best Offer. Free Shipping. Watch. Cessna Seat Belt Inertia Reel 5-01-465710 LH. Pre-Owned. $575.