[Hallicrafters] Selecting spline set?

[ARDUJENSKI at aol.com]

I found several sources for the subject wrenches but my problem is know which 
set is appropriate for the vintage radios. There appears to be 4 and 6 flutes 
type plus a range of sizes. How does one select the right combination?

Are the ones sold for Collins appropriate for most of the vintage radios 
using the bristol spline?

http://users2.ev1.net/~wb7dyw/parts.htm

Here is one source for example

http://www.mgs4u.com/bristol.htm

Thanks for tollerating such a basic question

Alan KB7MBI
Woodinville, WA