Ok, can't thank you guys enough for the info.
So, it sounds like I can NOT Franken this particular model but should be looking for a 42mm 5th version. Getting a 4th version UPO is a great idea as well however as I want a 42mm and not the 45.5mm the UPO is out.
I'll now start looking for a 42mm 5th version. Does anyone know if these are available for purchase new or will I have to buy used? If they can be purchased new, any links would, again, be greatly appreciated.
Cheers,
Chris