So, with that gate, the film is running against the flat metal surface on each side of the gate? If this was custom made, how do you create something smooth enough so as not to scratch the film while it's moving?
Would it be possible instead to have two rollers on each side of the gate rather than the solid metal block? I'd think that getting the solid metal blocks machined would be quite expensive, though I've never quoted out something like that.
Edited to add - Looks like you can see the laser module in the lower picture used to register the sprocket holes.