Make sure the take up lever is at/just over the top of its travel, as well as hanging on to your thread tails. These machines definitely have a "sound", the higher pitch of the 401 indicates to me that the upper motor bearing could use a drop of 30wt. oil. I keep a syringe of 30wt. just for these motors.
Cari
Last edited by Cari-in-Oly; 11-02-2015 at 07:56 PM.