Ok, ok, thanks. Sounds good. I am just going to keep what I have. I love the 45. The 23c has sticky focus, and I heard that is what all are like, because I have another head I got cheap, and it is the same. Maybe I can fabricate a fine focus system for it.
If its sticky the focus mechanism probably just needs cleaning of old lubricant, re-lubricating and adjusting for pressure/tightness and it'll likely be good as new.