Great question. It’s fairly easy, but needs an extra component.
Tern has a product called the telescopic seatpost, which allows you to use more conventional 27.2 mm seatposts, since the telescopic post is in two parts (the lower half goes into the bike’s frame).
Then I got the Suntour SP12 NCX, and replaced the top half of the telescopic seatpost with that.
Installed and saddle, and that’s it.
It really helps to smooth out jolts, and find it much more comfortable when riding on a bike with smaller tires.
🤗
Awesome! They make a nice suspension stem, too.