Re the possibility of a bent crank. the G23 uses a double threaded rod that screws into the crankshaft as the prop shaft. It's relatively small diameter lends itself to being easilly knocked out of true. This prop shaft is easily and inexpensively (circa $8.00) replaced.

Re the acetate diaphram. It will not hold up to heat as well as the Teflon. The rubberized diaphram does not hold up to the 10 percent ethanol laced gasoline we have for pump gas here. Some fliers using gasoline get non-ethanol adulterated gasoline at a local marina, but not all marinas have this.