Ok here are some pics showing the parts I used. At the top are the stock Lionel gears available from North Lima. Below them are the gears made from the items below them including the SDP gears, brass tubing 3mm ID, 4mm OD and 3mm x 12mm 316 stainless dowel pins. The latter two items from McMaster Carr. The brass sleeve was required because the 19 tooth gear came with a 4 mm center hole. The sleeve was fastened to the gear but I think I will allow the shaft to float in the sleeve.
Part numbers for the SDP gears are:
A1M2MYZ07013
A1M2MYZ07019
The Lionel gears are 5 bucks each. The SDP gears are less than 2 bucks but require work and a few more parts.
Just as a reference point a forum member had these made in the same material but at 20 times the cost.
Looking at picture its difficult to tell the difference between the Lionel gears and the SDP gears. I hope to try and determine if the current Lionel gears are still made of Nylon or if they have switched to Delrin before installing either one in my engine.
Pete