Don't know anything about the video, but the cartridge guide controls the position of the 0 counter, and the cartridge pressing against the bottom of the bolt controls 1 through 5. The bolt must be closed for the counter to indicate properly. Changing the carrier spring tension/torsion has nothing to do with the round indicator.
Missedbycracky I believe you have been corresponding with JeffG about my lever fitting issues. Thanks for the input
