I have Invisigrip on mine but it doesn't work as well as I need it to ( severe carpal tunnel in both hands- surgery on 1 next week).
so after following this thread I applied hot glue dots to the ruler I use most often (after I took the Invisigrip off).
It works great! I only need it when I can't use my Go, but will have to apply to my other rulers too
thanks for the tip
