First, check which throat plate you have - mine came with two - one is meant for straight stitching only and has a hole that is barely bigger than the needle. This one will allow for the least chance of the material being sucked into the machine.
The second style of throat plate has a wider hole that is necessary for zig-zag and twin needle stitching.
Personally I keep the wider holed throat plate on at all times since I tend to forget to change it when I switch to zig-zag position for bar tacking things... ruined many a needle that way...sigh. All three pressure feet are sitting beside the machine!
Pressure feet also come in two styles - one strictly for straight stitching and one that CAN be used for straight stitch but also for zig-zag.
The combination of the both the throat plate AND the wider foot might cause the lighter weight fabrics such as noseeum and ripstop to get sucked in, particularly if your foot pressure isn't tight enough.
I just checked mine and two pieces of ripstop could not be pulled manually by me when held in place by the pressure foot. I did not yank on it or try to arm-wrestle it, just tried to firmly pull the fabric.
As with anything, always work with scraps of fabric to test any tension adjustments before working with something you want to keep.
Once your tension is set and your pressure is adjusted, there should be little to no further adjustments needed no matter the thread, fabric or number of layers.
I have a Singer 401A and haven't touched the adjustments in years. I sew everything from noseeum to straps, and denim jeans to taslan hiking pants, silk for pillowcases and liners and fleece.
It's not like a car engine that one always wants to tinker with to get just a little more power from...
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