241-13 Singer jammed stitch regulator

[brocken]

Does anyone have a diagram that shows how the stitch regulator works?

I have tried force, heat, rust inhibiters to loosen the jam to no avail.

It first jammed in short stitch....I managed to push the ratchet forward in order to

bring it to long stitch but it remains jammed , unable to move the wheel back to 

select smaller stitches.

I am out of ideas...help

[fredk]

Is the adjustment lever screwed tight with a reverse screw thread?

[brocken]

adjustment lever ?  Can you describe where that is? Is it the one that controls

the dog height?  I dont recall any left hand screws. You may be on to something here.