[QUOTE=bkay;.
If you do need to go to a sewing machine repair place to get a replacement, just unscrew the inner wheel and take it with you to make sure the screw will fit.
bkay[/QUOTE]
Nice description on Janey's last post. If you do end up taking the clutch knob/wheel in, be careful as you take it apart and put it together. The two inner washer lobes must fit in the shaft right and if the washer falls off and turns over you will be in for a lot of trial and error figuring out which way it goes. But bkay is right., beats carrying in a whole head.