Hi Mac
Glad you found my PPCo scope strip down article of use.
I have had at one time up to about 6 or 7 PPCo scopes of the 2 main Brass ocular housing types in my possession and worked on a few for collector friends. I have never come across anything other than right hand thread fitting of the ocular housing to tube end on both types. Not confusing one of the GermanR Fuess scopes are you, Helios 3 type if I recall with the PPCo scope? The PPCo seemed to borrow or steal the R.Fuess design for their version for War Departments supply and some R.Fuess made ones seemed to have been used early on in war. Having owned PPCo type R Fuess scopes in past, apart from the fact the ocular housings not inter changeable with PPCo and threads being different I cannot recall the R.Fuess type being anything other than right hand thread either.
The ocular housing on the ‘long cone’ PPCo type housing is a normal right hand thread and I just double checked on one of mine. I.e turn clockwise to tighten and anti-clockwise to remove. I also believe that this type ocular housing is one piece and does not have the removable collar like the ‘stepped cone’ variant.