I know both cameras by heart but i am no repairman. i am the owner of the delphi-forums-rotating panoramic camera-forum.
im my opinion some important screws need loctite to be used. attention: there are special-screws(with two holes which rotate the opposite way. a special opening tool is needed.
my ho 202 had been rebuild by my repairman here, also widelux 1500-expert. in rangefinderforum i have given detailed instructions how to increase DOF(by changing distance lens to film)