[R-390] six position rf bandswitch

[Norman J McSweyn]

Hi all!
I cleaned the geartrain by seperating it from the rest of the rf deck. The six position rf banswitch won't align properly(they all do work, however!). I have had the deck out three times and it's still not right. When tuning, sometimes you have to go below (electrical) the band and come back up. The manual is pretty vague, such as: "center the contacts on the switch". 
Not very helpful. When this deck was out, I looked carefully at the switches and I do realize that if I screw this up by a few degrees, it never will work right. Does anyone have a good proceedure to set the switches so that this works every time, or is it just an "r390a-ism"
It's a bug that I'd like to shoot once and for all. 
Thoughts, questions or comments!
Norm n3ykf