Thanks Crem that's a good write up. I'll have to study your process a couple more times until it sinks in, but I'd like to do this. Haven't had good retraction since I bought it 12 years ago!!
IMO this how-to should also be in its own separate thread as its a bit hidden here. A very common Patrol problem that people would likely be searching for a solution. Can a mod copy this into a dedicated thread? @AB
Thanks Cremulator great info mate!