A very nice mod. Scalpel holders are wonderful things to have. And the Leap certainly is an underrated little tool.
I have a couple of them with missing blades that I intended to perform this exact mod for, but haven't gotten around to them yet. I prefer the 60A blades, but they are definitely too long to fit within the Leap frame. It still would be a great function to be able to attach the shorter blades though.
Would you mind sharing what was used as the donor part for the holder?