My New Heavy Duty Singer 4423

I'm loving my new singer sewing machine.  It is advertised as a heavy duty machine and in my opinion is holding up to the tag.  I've had this one for 3 or 4 months now I think and all I've used it for is denim quilting.   It has been doing an excellent job and would probably even do better if I new or understood better how to adjust the tension on my foot/feed dog.