Hey Gary....


Look at where the casing guide and control handle meet. You should see an allen head set screw on either side. Loosen both sides up a few turns to release the core cable. Once the core cable is pulled out, push out the anchor pin or dowel and the casing guide will fall out. To install the new cable, reverse the process.
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When in doubt...use the manual
Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.