When you tie on warps, whether you lace on like I did here, or tie on with surgeon’s knots, you can begin weaving right away without rags, toilet paper, and such. See the solution, below.
This way the warp weaves the width it’s supposed to be and doesn’t splay out. Also it’s not lumpy. Sometimes I begin with the 2-stick heading so I can cut off the knots for a smooth roll-up on the cloth beam. Often, I begin the way I did here, just to see how the sett is and what things will look like. That becomes my sample. Then I make the 2-stick heading when I cut off my sample and other pieces as I go along.
Throw 3 wefts without beating. Then beat in all 3 at once. You are really not beating hard—more like gently putting the wefts in place. You will feel a bit of resistance as you beat in these 3 wefts. This is how the warps are spread out from their groups in the bundles. The wefts should now be close to or against the knots on the apron rod. If there are still separations in the warp between the warp bundles, repeat the process by weaving in 3 more wefts and then beating them in all at once. Note in the illustration that the wefts extend out beyond the width of the warp. This prevents the warp threads from narrowing in when 3 wefts are to be beaten at once. I weave these wefts as tabby or close to it if tabby can’t be made with a weave structure.