How to remove rusted seized needle plate screws?

[Cascabel]

Get a short screwdriver that uses  1/4 inch replaceable tips.   Choose a tip that is a PERFECT fit in the slot, or grind a little to get a PERFECT fit.   Use the screwdriver handle to exert STRONG downward pressure, and turn it using a 1/4 inch wrench directly on the tip.  That usually works for me.  If you have already boogered  up the slot, then all bets are off !!

Edited December 10, 2018 by Cascabel
misspelling

[Itch]

22 hours ago, Hockeymender said:

I’ve had success with Kroil oil. 

I have rebuilt a few Old Motorcycles and Kroil is the best thing on the market ..

[Samalan]

The best penetrating oil i have ever used is a mix of   1/2 Break fluid  1/2 acetone  very slight tap's very tiny hammer . 

[dikman]

The other one that a lot of people swear by is 50:50 Auto Trans Fluid and Acetone.

[Kryptonite]

Thanks to everyone for their input... you guys are the best.

I got every screw out with almost no damage. All the screws soaked overnight in PB Blaster. The 2 needle plate screws came out with a sharp little hit from corner of a chisel, great tip Bob, it was the ticket! The 2 tiny gib screws holding the bobbin case needed 20-30 little taps of a small hammer hitting a screwdriver seated in the slot, mimicking a vibration thing. The machine sews great - money well spent.

Thanks guys,

Will in Central Florida

 

Edited December 10, 2018 by Kryptonite

[DonInReno]

Great news - good job!