I have the same exact question as the other person. The white locking piece seems to have cracked. It was running when all of a sudden the arm jumped out and I noticed the white piece was cracked. I was able to click it back in and finish but the clicking was also louder than usual, I thought. Is it possible to get just that white locking piece to replace? Thanks.
You have to send arm part removing from machine to us, our technician will check and fix it. or otherwise you have to buy new part demand on condition of locking piece.