Brother LS 590 needle bar moving
 

I have a brother LS 590 and recently change the light bulb. The light bulb broke off while changing it and had to try to figure out how to get the broken lightbulb out. While doing so somehow I either remove the screw I wasn't aware of or loosen one up.. my problem is now the needle bar will not stay still and keeps moving so that the needle keeps hitting the plate and breaking. Does anyone know where to tighten up the needle bar? Thanks

Maybe search for a Brother machine help site? or phone number? Wish you luck!

The bar itself is usually held in place with a set screw. If moved just a little it can become loose. The set screw will be flush with the bar and will require a hex key (Allen) wrench to tighten it. You can find a set of small ones at most discount stores in the hardware dept.