Join Date: Dec 2000
Location: Toronto, Ontario, Canada
Scratchy Arm Bar Noises
The bar retainer spring might be sitting at an angle - the 'ball' of the spring protrudes through a round hole in the shaft of the arm-holder, and interlocks with the jack-like tip of the bar to give it a bit of a lock-in. Anyway, when that spring is rotated to one side of that access hole through the shaft wall, it can scrape 'unevenly' against the bar when it rotates, causing that type of noise. It can also be the 'ball' end of the spring touching the side of that relief hole - again, a symptom of the spring being off-center to that hole. So, you might try releasing that spring, and very carefully re-tightening the locking screw so that the spring is perfectly centered in the relief hole.
(Needless to say, I've had the same problem before, and this was my faithful solution.)
Hope this helps.
(PS: a tiny drop of lube on the 'ball' end of the spring - or the channel at the tip of your bar - could help here, too. A teensy spritz of WD-40 or something might do well here...)