Ron, sadly, I've never been able to get my hands on a complete installation manual for the IH Narrow Frame spring assist. Here's some photos, a parts diagram and a cutaway view from from the installation manual that should help explain the installation. (If anyone out there happens to have a copy of the installation manual for the Narrow Frame Spring Assist that they would be willing to scan and email me or photo copy and mail to me, I'd gladly send a set of DVDs with a complete set of my scanned manuals, brochures and whatnot in exchange.
TIA)