I did not approach the Martinelli booth at the quilt show. I am just going to wait for my friend to take care of it. I have had this Slotted ruler for a couple years, never used, still in original package. I do however, use the ergonomic rotary cuttery from time to time.
I buy my blades from Harbor Freight which is a supply store for businesses. These blades fit my all my rotary cutters and the cost is unbelievable. Two blades for less than two dollars..the blades are used by the people that put carpet in a home and cut the carpet with the blade, different cutter though. So, if you have Harbor Freight in your area check them out..or look online.
Thanks for asking about the ruler, take care,
Linda J