Model couplers – the Precision Scale ¾ MCB knuckle coupler.
A temporary post to illustrate a current thread on the Maine On2 Yahoo! group.
Precision Scale Models have a scale ¾ MCB knuckle coupler in their extensive product range of brass parts. Part number PSH-4032-2 is described as On3 coupler, regular shank, slotted knuckle.
Dimensions: the piece of wire is 1.197″ long: the knuckle on the left measures 0.186″ high: the left coupler body measures 0.254″ across its maximum width and the left coupler shank measures 0.095 – 0.097 wide.
The Precision Scale part is accurately scaled, with a working knuckle released by a working pin that can be operated by a working cut lever. It would make a nice front coupler for any On2 loco that only very occasionally needs a working front coupler, but it does require careful assembly.
Jerry Kitts of Foothill Model Works wrote of his experience with these couplers on his Westside logging models: “I have been using both the PSC and Back Shop 3/4 size MCB working couplers but they tend to uncouple at all the wrong times. I keep going back to using Kadee #26.”