Thanks for all the info you have provided.
I have found some more info on the tour deals I asked about
It is the Grayline /Canal Bus Stop at Stadhouderskade 42 and says to allow at least 10 minutes to travel from ticket window to departure point, don't know if the 10 minutes are walking or what
I think the tours start about 1:30 PM
You are truly a gentleman and a scholar