Machine quilters resource. It is a forum dedicated to machine quilters but predominently longarmers.

Like this. It can be easily removed if necessary.
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Cindi - thanks for the explanation about basting upwards on the sides. I really like your bungee set up as well.

Thank you Cindi!!

A different method
 

I use my Chanel locks to keep my floated quilt top straight horizontally and vertically. I attach a tape measure on each side of the frame at the top of the loaded quilt. and place a pin on the tape at the left and right edges of the quilt. I then move the tape measure down to position it close to the belly bar. I shift the quilt until the bottom of the quilt is perfectly between the pins making any needed adjustments to make it fit. I then set my Chanel lock and and starting at the upper edge run the machine down each side and pin each edge in place. I then reset my Chanel block and pass the machine along the longest horizontal seam (not stitching) and make adjustments if necessary to straighten that seam. I do this each time I roll the quilt. When I get to the bottom border there are never any surprises. It adds about 4 minutes to each row but can save hours in the long run. I love floating the top. It gives me so much more control then when I use to attach the bottom.

I installed the bunge cord with the clips- done four kids quilts and - man oh man is that nice!

So glad it works for you, Cathy - I hope it’s making the quilting easier for you!

I read through all of these, I was going to add that I use a centering measuring tape to keep my floated top square. I like the idea of basting "up' the sides and the bungee cord idea too. And Cindi I sent you a PM. Just love your cutting table set up! thanks for posting.