are there any differences between a classic dif.e.yo kkbearing and the yyf central track bearing :-\ ???
The outside surface on the Konkave bearings are curved all the way and Center Track bearings have a flat middle and slanted edges to keep the string somewhat centered. The KK bearings keep the string dead center while the CT bearings still let the string move a bit. KK’s tend to be a bit snaggy and slippy since it doesn’t let the layers of string move about, the CT bearing fixes this issue a bit by having the flat center that lets the string move about.
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