Hello, Our 6520 SE 2006 manual shuttle is not engaging like it should recently. It engages perfectly when you push the lever manually on the side of the transmission. I’ve changed the cable but not really any better. There was quite a bit of wear where the cable connects to the shuttle lever on the aluminium lever under the dash. Sorted that but again not much better. Been playing with adjustment but again not really any better! Any thoughts? TIA.