I had several problems with assembly of the heater. The parts kit was missing one M5x8 mm bolt, four M5 nuts and four M5 washer used to assemble the heat shield on top of the heater. I purchased them at a hardware store but the kit should come complete. I also found the top of the cylinder housing assembly (G in the directions) was connected to the cylinder by poorly installed pop rivets. When I attached the pole assembly and mounted the burner assembly (part C) the burner wobbled due to excessive play in the pop rivet connections that hold the top to the cylinder. Two of the pop rivets near the access door were actually loose and not holding the top to the cylinder. I purchased a set of bolts at the hardware store and installed them by drilling holes near each pop rivet and installing bolt assemblies (bolt, nut, 2 flat washers and a lock washer). This secured the cylinder assembly that holds the burner assembly. This appears to be a combination of poor design (using pop rivets to secure critical components) and poor installation of the rivets.
Once assembled the heater has worked fine so far.