My attempt at shooting 135 in RB67 so far

[MCB18]

FWIW, Mercury Camera Co. makes a 35mm Pano kit to convert the RB 67 back to handle 35mm film. It replaces the film gate of the back with one with a 35mm 24x67 opening. That should help film flatness. They don't address the film counter as well as is discussed here.

There is also a 3D printable version of this here, in case you can 3D print stuff.

 

[Donald Qualls]

Here's a result I got the first time I tried 35 mm in my RB.

Cornfield

• Donald Qualls
• Sep 30, 2020

 

[MattKing]

To load and unload film, I roll 35mm film in backing paper, similar to 220 film.

Do you not mean "similar to 120 film" here?

 

[MCB18]

Do you not mean "similar to 120 film" here?

No, that wasn’t a typo. Attaching it to a leader and trailer is much easier than putting it on backing paper like 120. Extremely hard to get it centered. But I’ve had no problems loading either a full 5’ 36 exposures roll, or 65” 220 length roll, into the camera like normal 220.

 

[MattKing]

No, that wasn’t a typo. Attaching it to a leader and trailer is much easier than putting it on backing paper like 120. Extremely hard to get it centered. But I’ve had no problems loading either a full 5’ 36 exposures roll, or 65” 220 length roll, into the camera like normal 220.

I was confused by the reference to: "rolling in backing paper, similar to 220 film".
I never think of 220 film as being in backing paper - rather I think of it as being attached to a leader and attached to a trailer.