I've seen reference to this tool before but never inquired whether any copies are available as it appears to be handmade.
In any case, I wonder if the alternative of wired connections between the locos and cars in place of the infrared transmitters/receivers is a better solution for those of us who can't leave the set on the tracks all the the time? I have read elsewhere on this Forum that the connection is basically two wires but have never gone into it in detail - in particular whether there is anyone who offers the service of doing the conversion.
I've had a couple of really very odd problems with the stock couplers, which I won't go into detail about here. A wired connection would be of interest to me.