Patton - BD Seat Extender

A seat extension for the Patton BD Seat.

What is the BD seat? It's a pretty nice kit on AliExpress by "BeiDouQX" that includes a seat and side cushions for the Patton which is also compatible with the Patton trolley handle by flipping up the rear part of the seat, you can find it if you search for "LeaperKim Veteran Patton Seat" on AliExpress.

So what is the point of this seat extension? While the BD seat is pretty nice I prefer to sit a bit higher up so I made this extension just for that, I also designed it so that it has a small friction based locking/slotting mechanism so that the rear part is secured in place to minimize risk of it flipping up on it's own while riding.

I've added 3 versions in anticipation that people want options, personally I use the Large 48mm version and I'm very happy with that but I suspect some people might want shorter or taller versions. 33mm, 48mm and 63mm is the height from the top of the BD seat to the top of the extended seat so it's basicall