The cluster I worked on was VERY stiff from sitting in a barn for 20 years. I sprayed, soaked, & in general lubed it up. broke free and spun the individual gears with a channel lock. When it was done it was much smoother but still took considerable effort to spin the cogs especially the smaller ones. I did not have a remover that fit it so paid the $5 at the LBS to have it removed, but that included a better chrome dork disc too.