LaBella actually makes a set of flats specifically FOR stringing through the body. They tapered the 1/2 in front of the ball end and gave it a silk wrap. I use them on my Fender 51 P reissue, and they sound great - classic LaBella flats.
From their website:
Thru-Body Flat Wound String
(Available in all of the above sets)
La Bella Strings introduces the first successful flat wound bass string meant specifically for electric basses where the strings pass through the body.
These flat wound bass strings are specially designed for instruments with string openings through the body. This design adds a unique resonance as the strings pass through the solid wooden body and over the bridge from underneath. With this configuration, the resulting sharp angle located at the bridge can cause the flat wound outer wrap to crack, fray or break with standard strings. To avoid any damage to the string. La Bella Strings has engineered a durable yet flexible section near the ball-end. Both the string and great sound remain intact.
Yup, got a set on my Stingray Classic... no problems.


