Hi !! Today I am very very excited, I finally received my latest order, and in this order was ....... micro-trains couplers !!! I must say that installing them on rolling stock is easy, and the results are wonderful !!! Of course the couplers ans trucks came already assembled, so I have no credit here. But now I must install one in my Kato SD40-2 locomotive ... I must say that the is a very frightening moment. The kit I ordered (#2004) is in composed of many pieces. I can understand how they go together, yes, but the couple that was already on the loco (rapido) is a simple "snap-in" coupler (there's a rod inside the coupler pocket, and the coupler snaps around this rod). But the trick is: the coupler kit I have seems to be a body-mount coupler. Does that mean I'll have to make room for the coupler box ? I'm really terrified about all this... I haven't done a lot of bashing yet, and playing with knives and screwdrivers in my only "quality" locomotive makes me shiver ... Anybody has done it and could give me some step--by-step instructions ? Something like "Installing a micro-trains coupler #2004 in a Kato SD40-2 for dummies" ... Thanks !!!