No , not really Larry, since your joining 2 engines with one common banjo hub, one has to go....generally you can twist them off, sometimes you have to de:solder them, actually both need to come off because you need to drill straight through the "keeper" for the other steam line to join into, then re:attach & solder, you also must flip the left hand engine around, on a Jensen #25/75 its just a matter of unbolting the steam chest, flipping the engine around & reattaching it. on the Jensen #5's you might have to de:solder the steam line from the steam chest...flip 180 degree's & re:solder, or if your lucky it may just twist around for you.
Thanks Bruce, I've got four old Jensen 25's that would look good doubled up so I might give that a try down the road.