Spin lock rope clutches

You most likely have an aluminum backing plate with tapped holes bedded in the fibreglass, though I can’t say for sure if that was the case for 2011 production year.   In my case I did remove the ceiling panel in the aft cabin because I also installed a horn cleat to back up the clutch and prevent any slipping under load that will abrade the line.  I didn’t downsize the clutch but replaced aluminum cam and base with ceramic parts - these hold my 10mm warpspeed line fine under the initial tension and the horn cleat ensures the halyard doesn’t move with wind loading.