Sounds like a bad communication going on somewhere
What sort of thickness of board ?
Is it off the drive pulley ?
GTO46/52Z Variable Speed Belt for motor pulley (pressparts.co.uk)
What is the belt off ? (great diagram by the way :) )
You will need to use rollers that are compatible with the 2 different ink kinds, the automated roller & blanket wash systems if fitted cannot be...
You will struggle to get a single colour SM52 because they are only available in 2 colour variants & upwards, perhaps you meant a GTO52 or PM52 &...
How do you mean "is it too late in 2021" ?
I was being polite, imagine doing that on 20,000 B1 sheets o_O :(
If you can afford it try & go for the PM46 (silver & grey guards) which was the updated version of the QM46 (purple & grey guards) in which...
Just also bear in mind what models are available in the USA may not be available in the UK.
Wear on the drive thread possibly ?
Looking at the state of your machine from the photo i would say give the 2 detectors a clean & that may solve your problem. (they are by the front...
Roller installation guide (& other info)
Use yellow ink with some opaque white mixed in as it will show the ink stripes clearly.
Plate rollers to oscillators 4mm.
Plate rollers to plate...