Today while using the hedge trimmer at a steep angle I hit it on woody stems one too many times and the attachment spun in the socket, shearing off the plastic nub which holds the alignment pin into the tube. Is that piece, the gray plastic insert in the tube end where the attachment goes into the powerhead socket, replaceable? I confess I should have tightened it more, especially considering the off-axis torque that the angled hedge trimmer can put on the shaft. I have a so-so stihl dealer but they prefer new sales to repairs, and their repair department isn't all that great anyway. Surely others have done this...thanks for any experience you can share.