Hi Poco

I did not forget about you, I made the ring around and when I can break loose to take some pics and organize the chart I will send it to this thread as an attachment, give me about a week .
Now , your christmas wheel is actually green/magenta and if you move both wheels equally in either direction they are your red / green.
Also if you move all three at the same time you will turn the lights brighter or darker .
You will find very few occasions where you need the third wheel ( cross processed or poorly processed negatives or if you want to introduce nuetral density for some reason.)
I agree with Nick, but we have found here that the bleach can suddenly go and it is a remix.
Hope you are having fun.
best regards
Bob