Quoted from MrBally:
Nice haul of both St. Louis Missouri and Elmhurst, Illinois coin mechanisms. During my Route Days, those plastic mechs hardly ever jammed versus the steel and cast ones. No adjustments, with the exception of sliding the barrel magnet .125" to accept or reject Canadian coins. It was an issue being in a border town.
I have all kinds of trouble with the mechs in those pictures; I literally just replaced two metal ones two hours ago due to the constant jams. The only ones that work for me that are almost bulletproof are the Imonex ones.