do any of you have an recycle tool store from big industry? In Wichita we have a place called the yard, it sells obsolete aircraft tools & all kinds of other stuff .
I bought my 1 3/8 nf12 tap for less than $10--
place a thick washer in before tapping-- or you might chip the tap!!
I've also found it is easier to place the tap in a vise & thread the lca on it. Lawrence
ps- this info came from my 1962 service manual.