Such one was the first Z-loco I dismounted... (... yes I know, but I was young... ;-) )
The point is: The four cog-wheels between the coupled axles looks same but are not! Have a look at the exploded-draw () No. 20 on the draw has one cog more (or less, I don't remember exactly) as the other three (No. 19). So if you mixed theat four cog-wheels, you have to count the cogs of this pieces.
This principle is true for other steamers too.
Have fun (and "acrobatic" fingers)
Arnim
Am 01.04.22 um 21:01 schrieb Kian Holstead via groups.io:
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I'd stay away from this "fix". Not all loco's need this adjustment.
Recently I took a 2-10-0 apart to clean. I broke [...]