Hi Jim_MI...I am sure your experience was a bit "as* puckering" when the idler cable broke......My 2013 PA-14 now has 788 miles on the Mirage Drive.....I did upgrade it to the GT Drive with the bearings and sprockets last January, but used the same original cables.
I downrig typically in the 25 to 50 foot depth with a 4.3# weight.....sometimes to 75 feet while trolling a K15 quickfish and flashers or equivalent at 1.8 MPH for about 8 miles and know it does add extra stress to the Mirage Drive and components.
I too have noticed the plastic cable sheath cracking, but no failures to date...good fortune/luck??....to date, I have logged over 780 miles, by GPS using the factory original cables......I noticed in your photos the number of threads exposed, past the nylock nuts are a couple of threads more than my set up....possibly more tension on the cables or maybe the cables have untwisted when the nuts were tightened???
On thing I do, when adjusting the cable tension is to make sure the crimped end is secured from truning by using a 7/32" open end "ignition wrench" as the nut is tightened so the cable can't twist.....maybe this is an issue or not....who knows???
I know at some point my cables will eventually break/fail as the number of cycles is significant, so having a spare set on hand is a good insurance policy.
Your posting is a good reminder for all of us who regularly use our PA's "to expect the unexpected"
