[Milsurplus] PRC-74B/C mod for adding LSB

[Steve Saslow]

I believe the article PRC-74 Lower Sideband Conversion is not correct for The PRC-74B/C I have on my bench. Definitely impressive and includes several other mods. But apparently, for the PRC-74...And the author has integrity and has been very cordial.  But I do request HELP!  to achieve this result, selectable USB-LSB, using the one additional crystal...
      The mod (referred to above) step c. says to go into the Synthesizer Module. But the 1750 crystal oscillator is in its little metal box INSIDE the Freq Generator Module, a thin little unit right behind the Synthesizer.   AND, at that place, the 1750 KHz signal is needed for the freq dividers next to it inside that same freq gen module: the 10 KHz calibrate signal. I think that changing the crystal freq to 1747 KHz, there, will alter that set of dividers down to the 10KHz freq. (Also, there is very little physical space inside the crystal oscilator “can”  to accommodate what the article apparently calls for…
     Electronically, I think the 1747 KHz signal for LSB needs to be injected into the emitter circuit of Q4 the Demodulator transistor inside the IF/Audio module, instead of the present 1750 signal presently being brought there form the freq gen osc.    Here’s my question, -because I do not know enough:
               Inside the IF-Audio Module, the 1750 KHz signal (from the freq gen module) presently ALSO goes to the Balanced Mixer circuit, at pin 4 of the Balanced Mixer transformer. Should I leave that signal freq as it is, or will changing the signal to 1747 KHz there, be:  ???  OK/just fine? the correct thing to change also? absolutely not good? etc.  Please help me there!   
                    Your expertise will help me insert my 1747 KHz signal at the right place! Right there, intercepting the 1750 signal to the Demodulator Q4, I can arrange wiring and a relay (or double-throw switch) so one can select either the 1750 or the 1747 (USB- - LSB).  [I’m awaiting a very small and low-current programmable oscillator  -for 1747KHz- and the 3.3v regulator it requires, thanks to Digikey techs…]
      Apparently there’s a military radio group in Japan, which shows a picture of what appears to be the successful LSB mod. Could someone please give me that reference again, too?
     Many thanks!   -Steve K7EW  Portland OR