replacing cutting blades on singer ultralock
I have a singer ultralock 14sh654. My blades were getting dull so I bought new ones. I was careful in paying attention to the position of the upper blade. However when I put in the new blade it does not work. It hits the lower blade instead of crossing it. I googled it and there just is nothing out there about changing the blades. The manual only shows how to change the lower blade.
Can anyone advise me on how to do this? I really don't want to pay the 60.00 my local shop charges to replace them.