Welcome to the new and improved Proflex / K2 Tech Forum!
Bush= the nylon bearing which the brocken part of strut pivots on the swing arm. Also check swingarm main pivot bearings for side play or movement. Good luckChris
Two more question.Is the sitze of the swingarm the same for all the bike size. The PDF-File from collin suggest that yes.Can i Use the swingarm from the Proflex 657 for the Proflex 856? Are the other swingarms that are compatible?I just see Both question, answer is "Yes" isn't it!I collect the information from the tech archive on this forum. Very nice Forum!