https://www.lowes.com/pd/General-Tools-Instruments-6-in-Stainless-Steel-Contour-Gauge/10163711he contour tool was almost like this one sold at hardare stores. The needles came out,you would lock them into place and have the exact measurements and spacing. I will still look for mine, unless I gave it back to him when I was done.
I used liquid rubber to fill a few torn areas and then smoothed it out with the contour gauge.
Regards, Mark