Shielding plus side mount jacks can easily cause hidden problems. Grab some wide heat-shrink tubing and slide it over the arm any time you’re doing a side mount, it’ll save headaches:

Click image for larger version. 

Name:	E873CEFC-4C59-40BB-BC30-22D3C08025E1.jpeg 
Views:	293 
Size:	139.1 KB 
ID:	40347

Glad you got it sorted.