I purchased my gears from the site that Siegfried posted. http://shop.kkpmo.com/index.php?cat=c28
... 4188041672 I used the M0.15 gears. They have a worm gear to match. Wormgear M0.15 1.6mm diameter. Your link looks like the same site, but I cannot find the M0.15 gears!
My current chassis design has 1mm holes for the gears. As I mentioned I used the TGauge.com geared axles, cut off the gears, and slipped the 2.85mm M0.15 gears onto the axle. This was a real pain! I am ordering some new gears with a 1.5mm hole. Hopefully, they will slip over the TGauge.com plain axles. Actually, I am hoping that TGauge.com releases the gears that they will be using to make things easier for a steam chassis design.
I am going to make a few small changes to my design, and resize it for the 1.5mm holes. I may not get to it this month as I make my living as an airline pilot, and I have my recurrent check ride in a few weeks. I normally spend some time preparing as you have to pass or loss your job! This means that I will not be doing much modeling for a few weeks.
Did you purchase your 2.85mm gears with a 1mm hole or a 1.5mm hole?
Send me an e-mail about sending you a set of my chassis parts. I will sell you a copy of my chassis parts, but I will not send out any printed foam parts. I may sell some of my locomotive designs at some point like I do with my planes. I currently, sell some of my model airplanes as RTF's, but I am so busy with work that I am not taking any orders at this time. firstname.lastname@example.org