A few months ago, or less, someone bashed the Martelli Company referring to blades. I posted saying that one cannot use notched blades in the Martelli cutters....this was disputed.
I just returned from the Lancaster Quilt Show and visited, while there, the Martelli booth. Their wonderful demonstrators and reps enforced my post.....they always say that round hole blades are what are to be used with these cutters. Do NOT use the notched blades....they will impair the performance of the marvelous Martelli cutters.
I have purchased several Martelli products....their tutorials are wonderful, the tools themselves are efficient and effective. Their service is remarkable and reliable.
Go, Martelli!