HiloBoy,
I checked with Colwood and I will try to be as accurate as I can here in relating what they said. The gentleman was not sure if the Optima pens would connect to the Colwood RCA plug. If the Optima has an RCA recieving end on the pen it may fit if the two RCA's are the same size. If they are not the same size Colwood would be pleased to make you an adaptor.
He also noted that even when pens can be switched between different company's burning units there may be a slight difference in the way they burn on the new machine. Each company has their own power range and pen cord range. So they, of course, use a wire size that is most appropriate to their system.
Example ... my Colwood Detailer seems to be a 'heavier' power source then my RazorTip and my Colwood writing pen has a heavier gauge of nichrome wire then my RazorTip writing pen. So were I to use my RazorTip Writing Tip pen on my Colwood I would believe (I haven't done it myself so I am making a guess here) that the pen would heat perhaps a little faster and hotter on the Colwood.
Now, as a pyrographer I would want to be able to use the pen stash that I had already collected if I needed or wanted to change burner manufacturers. As Nedra pointed out, she has a pen that she has been using for six years ... at that time length it is probably a favorite. Who wants to lose their favorite pen because they changed systems -whosits, who wants to lose any pen stash because they changed systems!
So, I would suggest that if you are interchanging pens and burning units that you do a test burn on scrap wood just for that combination. That way you know the number range for the pen based on the burning unit. Just my thoughts.
I would suggest that you contact either Colwood or Optima directly or both for more ideas and information.
Nedra,
Yes, Colwood will and does polish tips if that's what you want.
Perhaps it's because I came into wood burning from the carving side that 'polished or unpolished' isn't an issue one way or the other to me. And, this review is based on MY experiences here

We wood carvers are obsessive complusive crazy about sharpening, brightening and polishing our carving tools. In fact if you check the carving threads about sharpening tools you'll see we are always talking about "I strop and I strop often!". Guess I just naturally have taken that obsessive trait right to my burning table.
Mike, my beloved hubby, has long been concerned that I will one day strop the writing tip to my old Walnut Hollow into non-existance because I have owned that one so long. 25 years and counting. I did purchase a new Walnut Hollow a few years ago. Not because there was anything wrong with the one I had but because I thought it would be nice to have two going at once with different tips.
For me, in my experience, the only time I have had a pen tip drag ... oops ... I should say first that I keep my cleaning strop on my work table and within reach no matter what burner is on the table ... is when I have become so involved in the burning that I 'missed or forgot' to stop and check for carbon build-up. Now that one is my fault not the burner or the pen tips fault. And that was on my RazorTip as I have barely used the Colwood long enough to get the new smell off of it.
One more thing here ...
I made a mistake! While I talked with the gentleman at Colwood and we were looking at Hilo's question he pointed out that I had made a mistake. The Detailer that I have does NOT have the 16 gauge cord. It has the smaller 18 gauge cord. So what I thought was their extra heavy duty cord is only their normal heavy duty cord. My apologizes for that one!!!!!
Susan