i've started perusing the local thrift shops and craigs lists, for my first ever sewing machine. now i seem to have no real problems zeroing in on a good heavy duty machine ( kinda drawn to the singer 15-91) i expect to be useing this for marine canvas/sails ,camping gearwork, with occasional forays into lighter fabrics. my question is can such a machine do lighter fabrics for some thing like t/u quilts and cothing repairs? or do i really have to have another machine for the light end of the spectrum? thanking all in advance