I STILL can't find scrap iron of the springs that I need. Is there any other way I can get scrap iron of the pogo stick?
Scrap iron is found in Marleybone and a bunch of other worlds. Springs are a possible reagent found when 'picking up' scrap iron. You can also transmute it if you can find stone blocks:
Marleybone, Celestia, and Grizzleheim are the best places to find scrap iron. The Bazaar supplies Scrap Iron, and other various reagent vendors around the spiral do also.