A simple re-make of the original for the IKEA Markus chair but with several different heights (40, 60, 80 and 100 mm) and a 10 mm adjuster. ( Copied into Tinkercad and adjusted the heights and placed all on the same plate) The original file fit my RH Logic 4 chair but is a bit high with. Here are 3 different heights with a 1 cm spacer as well. 

I'll print it in clear PETG with 99% infill.