[Hallicrafters] SX 42 teck question

[Nash4447 at cs.com]

Fellas

I am overhauling an SX 42 and am near the end and about to align the set. 

However, before electronically aligning things, I am wondering if anyone can 
offer advice as to the proper mechanical keying of the 2 plastic dials to 
their shafts as well as the keying of the crystal filter and BFO knobs to their 
shafts. 

With regard to the BFO/crystal filters knobs, I note that they are attached 
to small butterfly condensors behind the panel. I would assume that with both 
knobs on their zero marks, the butterflys should be exactly half meshed. That 
way there would be a sweep from condensor fully closed to fully open when the 
knobs are moved to the "5" marks on either side of zero. Am I right?

With regards to the bandspread dial. I note that when it is set to the zero 
line, the condensor is fully unmeshed ( minimum capacity ). Is this right?

The big question relates to the main tuning dial. Before removing it, I did 
make alignment marks so I could put it back where it was but nevertheless, I 
would like to know for sure that the dial hub is locked to it's shaft in the 
proper place. 

The manual says nothing about these matters. 

Anybody have any ideas?

Thanks !             Glenn K6PZT