I run into this problem all the time and what I do is use D'Addario J-74 or J-75 strings with the loop but as I string them on, I use a 3 inch length of a wound G string from a J75 set and slip them into the loop so that they can't pass through the bridge. Works great. I have also done a loop pass through on the bridge like a classical guitar string bridge and that works but not as well as using a string in place of the ball loop. The other thing I do is keep a couple of sets of balls from used strings on my bench and will install them on loop end strings with needle nose plier and a couple of twists and they go on very easy. Problem solved with several options.
Cartwright's Music & Repair Shop
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