Can any body tell me where to start the film on a roll film back for my Super Grafic. Loading the film isn't a problem but I don't know where the film start is located. I don't have the instruction book to go with this Singer RH 12 back.

With the holder empty remove the insert and look at the top of the film compartment. At the 2 o'clock position on the left roller side there should be a white arrow. Insert fresh roll of film into into the left roller slot, pull enough leader out to wrap around and insert into the take up roller on the right. Advance film knob or lever until start arrow on the film roll aligns with the white arrow mentioned above.
Install insert into shell and with darkslide installed, turn the indicator wheel to "S" then advance film via the wind knob/lever until 1 is at the indicator mark.
Charles