bkb555

a few questions..i just happened across the Sparx skate sharpener while researching re-riveting my new holders...anyway, it sounds pretty cool BUT....what if you have a different radius on blades than what you "think" you have....I really don't know my radius and when I ask at the pro shop , they say 1/2" one day, 3'8 another time and 5/5" another time....what if you put you 5/8 on a Spark 1/2" ring?....what if a blade is bent to start????on the Sparx website, the cost is $799 but last march it was $599....what is the cost????......great idea but it was better at $599