Thank you so much for the replies! I uploaded a pic and tried to explain the situation. I used to be able to change the stitch length but ran the machine while doing so, now it seems jammed when turning the hand wheel while holding the plunger down. There was no screw in the first hole I pointed out. I used the screw for the oil guard, screwed it in and it went in a decent amount, put everything back together but still no changes.. I just don't know what else to do or should I try and find the proper regulating screw online? I believe there was no screw there to begin with, I was able to get pretty short stitches, I believe the max is 12 or 14 to the inch. If the screw was there, i would've been only able to get 7 per inch. any ideas?
Just an fyi, its stuck on the longest stitch length. Also this is the top of what I saw where the plunger pin would go down into (into the notch that pushes down). So.. before i took the cover off, I push the plunger and turn the hand wheel, plunger then goes down all the way into the notch that pushes down, I stop and take the cover off. Just to give you an idea if something looks out of place or if something shifted when I ran the machine with plunger down. Sorry if it sounds confusing.