Hi,
I used a REGULAR sewing machine for my "Checkered" upholstery, Which is probly the THICKEST sewing you could do.......
BUT, I bought the heavy upholstery needles , and upholstery thread...
If you get to an area that has multiple layers of material , Just "help" the machine through by pulling on the wheel while feathering the foot pedal.
If you look in the background of my project "Checkered upholstery" you can see the "old" "regular" sewing machine that I used..... If you get an old used one....I hope you know alittle about adjusting them......
Gotta Fly...
Mike in MN N381PM