Last year I ran across this (kinda funny) video and have had great success pin basting large quilts on my kitchen table this way.
https://youtu.be/jnke_KzeTI8
I purchased eight clamps similar to these at Harbor Freight.
https://www.harborfreight.com/2-12-i...amp-69290.html
I find it much quicker, no strain on my back and the results have been great (i.e. quilt is centered).
I remember there was another method where you folded the layers on boards of wood? I never tried it but I'm sure it would work too!
Good luck finding what works for you
