noun

a machine or device that appears strange or unnecessarily complicated, and often badly made or unsafe.

repairing stereos and making contraptions out of spare electronic bits

device,gadget,apparatus,machine,appliance,mechanism,implement,utensil,invention,contrivance,Heath Robinson device,Rube Goldberg device,gizmo,widget,thingamajig,thingamabob,whatsit,doodah,doobry,gubbins,dingus,doodad,doojigger,doohickey,bitzer,thingo