So I was restringing my dads Uke that has a Tie Bar bridge. using the over-under-over-under knot. I had absolutely no problems, until I got to the A string. I did a double loop and as I was trying to tune it, the knot would completely slip out. I was able to make it hold with a triple loop but, is this the norm? I was able to tune it no problem but being somewhat OCD it's still bothering me.