I believe NWSL reveals the lengths in their catalog, along with diameters, material and prices.
If you need a shorter, you can shorten the sleeve. If longer, use two or more.
If layers of aluminum and paper work for you, sounds great. Cheaper, and you don’t have to wait for delivery.
Ed
Or maybe in Home Depot a brass tube can be found, like I found one where I live (in a store similar to Home Depot in USA): 1,4 mm ID, 2,0 mm OD. When pressed on 1,5 mm motor shaft, you get nice tight, absolutely centric fit. And all that for 1,1 USD for a tube 1 meter long.
Pressing such tube can be a problem if motor shaft is short, and you want to make it longer - brass could bent. But, if price is like above, it is worth to try.
Hrvoje
i wondering about using something maleable to mount the motor. It seems to me that gear lash is likely to be larger than desired by just glueing a motor in place unless the glue/caulk shrinks.
if the gear were tight, the glue could flex and maintain a tight fit. Not sure how to accomplish this. maybe a rubber band around the worm
i tried adjusting a motor (not planning on replacing). When overtight, the motor stalled. couldn’t find the sweet spot, hence wondering if somethign sprung would be good
For a vertical mounted motor like that, if replacing the motor with a can motor, I’d think some sort of brass strap would be the way to mount it. L shaped bracket, which bolts to the loco chassis, and then a tradle of some sort glued or screwed to the motor and attached to the bracket, either soldered or screwed to it. a slight oblong hole in the base of the L would allow it to shift for gear lash adjustment, but the natural amount of play in a clearance hole may very well be enough of an adjustment.
–Randy