Well I kinda beat this subject into the ground WRT G508's (no matter what blowhards like Bend Me Over and his 60 seconds of CCKW experience says).
TM9-805 is pretty much useless. As the manual says, its an OPERATORS Manual, first echelon service only. What does that mean? It means that the repairs are limited to either adjustment, or replacement of assemblies.
You really need the TM10's to MAINTAIN (they really were called MAINTENANCE MANUALS for a reason).
This is THE BEST TM source on the planet. Don't bother with Portrayal (they don't have TM10's and the quality if at best, fair).
For €12 (about $22) you can download this:
http://www.tm-ww2.com/product_info.php? ... cts_id=295
I have a TM10 on the way... when it shows up I'll scan it in. And no, its not a copy of the TM-WW2 one.