Yesterday I put new La Bella MUS flats on my Sire U5, using thru-body stringing, and replaced a light set of round rounds, strung via the back of the bridge. The flats had a possible problem - the silks on some strings extended over some of the saddles! Apparently, the U5 bridge location is closer to the thru-body ferrules than is the case on Mustang basses, which these flats were designed to fit. I emailed the vendor and LaBella for replacements thinking the silks on the ball ends were maybe not to spec and continued to work on the problem. This morning, I cut the end balls off of a set of old strings and restrung the flats using the end balls as spacers on top of the original end balls. Result: more metal string over the saddles, better sustain, and total body vibration. And with the flats, I was additionally able to lower the action! Have any of you ever had this silk-on-saddle issue? Is it a real problem?