Presser Foot Sticking

[Constabulary]

Not sure but try this: loosen the set screw (from mack side) and adjust this thingy here with a screw driver - there is a slit on the top side. You can also raise it a bit just carefully hammer it a bit upward

Edited January 22, 2020 by Constabulary

[Teslabolt]

7 minutes ago, Constabulary said:

Not sure but try this: loosen the set screw (from mack side) and adjust this thingy here with a screw driver - there is a slit on the top side

Brilliant! That did the trick. Thanks! 

Just in case anyone else needs to know, here is the location of the screw that I backed of a bit. Too tight perhaps. 

[Constabulary]

I meant the fork type part but in the end you figured it

[Gregg From Keystone Sewing]

And that's the other thing to check for on the machine.  Not at all uncommon for this area of the machine to hang up if not adjusted properly.  

[Teslabolt]

Found a more likely culprit to several woes on this machine. The presser bar extension was bent. Is this common on these? How does that even happen?

 

 

[SolarLeatherMachines]

29 minutes ago, Teslabolt said:

Found a more likely culprit to several woes on this machine. The presser bar extension was bent. Is this common on these? How does that even happen?

Commonly known as "buckling".  Too much compressive force on a rod will cause it to bend and deform.  The longer and thinner the rod, the lesser the force required to buckle.  

F = n π² E I / L²     is the Euler formula for long, slender rods if you're interested.  

At some point, the machine forced to sew something stiffer and harder than it was designed for, causing the rod to buckle.  

Edited January 24, 2020 by SolarLeatherMachines

[Gregg From Keystone Sewing]

Most often this occurs when someone who does not know that this will hang up if you remove the needle bar rock frame without pushing it out of the casting hole on top.  It can be usually bent back in place and does not have to be 100% straight to work very well.