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All I know this is going to sound obscure, but I have noted that the GER - and MR/LMS and BR - used a device known, on occasions, as the Monarch Patent Door Damper (or something like that). I have plenty of photos, such as the one attached (the device in question is that lever above the V hanger that is hinged to the door and drops down to the solebar, meeting another hinged assembly and seemingly disappearing into the solebar - but I may be wrong!), to give me an idea of what it looked like. The question is, how did the thing work? My geometry and mechanics is a bit rusty - I think I know, but a more informed viewpoint would be most welcome. So why ask such a daft question? As a GER modeller, I have found these things all over a number of wagon diagrams, all of which are plentiful in my plans to populate my model. In addition, some MR/LMS and even BR wagon kits (see the 13ton goods wagon image attached) I have on my bench also used this, or a similar, device to dampen the descent of the wagon door(s). I therefore need to represent this device. I have looked at creating one, and decided that 3D printing is the best way to produce such a tiny thing in 4mm scale. Nevertheless, I am one who insists it must be 'right', so hence the need to know what goes on when this thing starts moving about (up and down?) and performing its function - or in other words... ....the 'door sprung technique' I suppose. Best, Marcus