Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4648801.
A customer brought in a Chinese chainsaw that he'd bought online. The choke level had broken and he didn't have any of the pieces. I've never heard of a PDTO, so I have no idea where to get replacement parts for this or if you even can. Fire up FreeCAD and a few iterations later, we're up by another happy customer.
I printed this in PETG to hopefully withstand the temperatures within a chainsaw at a layer height of 0.2mm and 40% triangular infill. You will need supports enabled and I raised it above the bed by 10mm so that the knob was better supported. The original lever more than likely had a plastic pin that hooked into the choke lever, but I knew that 3d printed plastic at that diameter would never hold up. Instead, I cut a small piece of heavy-duty wire I had laying around (maybe a coat hanger?) and bent it into a small 'L' shape. I heated up the longer end with a torch lighter and then pressed it into the hole, with the 'L' pointing towards the knob. Hook that into the choke lever and you're good to goat.
NOTE Due to either a Thingiverse bug or (more likely) shadowbanning, my models no longer show up under the [Newest] listings. If you want to see more of my models, please be sure to 'follow' me. If you print this, it would really help if you'd post a 'make' so that others could find this model.