Player) Skate Sharpening Hollow equivalents and Shapes, for reference. I made this as I did the results of the survey, thought I should share. Red outlines most common choices for our sub. :
The Ultimate Guide To Figure Skating Sharpening
Maintain the Edge Handheld Hockey Ice Skate Sharpener (3/8" Radius of Hollow), Skate Accessories - Amazon Canada
Choose Your Radius - Wissota Skate Sharpeners
Anatomy of a Skate Blade Hollow - Eddie's Hockey & Skate