I’ve taken one of my shades down, and it’s a 38mm diameter aluminum tube with one keying notch. Looking at motorizing them, I found lots of recommendations for the Zemismart roller motors in HA forums. What I don’t get is how they fit?

I pulled the spring mechanism out of one end of the tube, but it looks like the zemismart tube needs to fit all the way inside my current tube, which it won’t. The diagram on the website says their tube is 17" long (436mm), which is half as wide as my window. I don’t see different lengths for sale.

What am I missing? Do the motor tubes extend? Do they only shove halfway down inside the roller tube? The example videos in their store all show windows wider that 17" …

I’m so confused!

I’m also unsure about the “Tuya ZigBee” label. I can still use these with my current ZigBee setup, can’t I?