Load them into the cassettes very carefully. They will be scratch marks at various places on the film. Nothing will be exact. On gear driven rack systems check all the gears for wear or defects. Check all componets and replace or afjust parts as needed.
All models use bearings on the shafts or rollers.
If you find any that is loose or worn replace them. Clean or replace as needed. Too much heat will cause pickoff. Adjust the dryer to the lowest setting that will allow the film to dry completely. Actual pickoff will be small clear areas where the emultion has actually been removed.