I`d have a go at going to the above post ? Odins-sidekick is a good chap and have a good team, worth a try ??
as for the hoppers I`ve found that both are very good hoppers and match in every way but I`ve found also there is a slight difference to the angle of the feed top of the loader when filling, the Spire is flat where the Rotor is a slightly angled when putting the balls in, although designed to load while still shooting ( as one should be anyway ) it depends on the angle of your arm when loading, with me I find the Rotor is better, with the Spire I find my elbow goes that little bit higher to load, as with both I also find it`s better to have Fresh Batteries for an Event as opposed to try to keep the same batteries thinking they seem to last for ever !! maybe this could be the reason for a lot of players having ball jams during a game, then blaming the hopper. got to say though, the batteries Do last in them.