New cyli, cylo and ring primitives.

[Javier Orquera]

I think the conclusion already is that this type of rotation inside a primitive is a no go.

Use mirrored and divided primitives instead. Your suggested a3-8cyli should be created like this instead:
1 12 0 0 0 0 0 -1 0 1 0 1 0 0 3-16cyli.dat
1 12 0 0 0 0 0 1 0 1 0 1 0 0 3-16cyli.dat

So be it. I give it a try, but as all of you say, it more convenient divide the prims.
I send an email to the PT Admin asking for the deletions of my primitives; and updated again the p/npeghol2.dat with your suggestions. Just needed to submit it and the other parts.
Thank you all for your opinions.