re: stanley plane parts compatibility

There is some cross compatibility. 4s and 5s can share frogs, blades, and caps; same for 6 and 7. I believe 2 and 3 are the same but don’t quote me on that. There are others like a 10 I think borrows a frog and cap from a 4 but you’d have to modify a blade from a 6. That’s about all I know.