Finished the folding bike today too.
Upgraded the stem to a metal one, and to adapt to any standard handlebars. New 7 speed thumb shifter to replace the broken grip shifter. New brake levers, new grips. Installed lighter removable plastic fenders. Added a bottle or travel mug holder. Bought a Rhinowalk bag.
Looking to sell it ASAP. Asking US$150. I have too many bikes now. Please be local. Prefer you can come get it from me.
It was a fun project. I learned a lot.