Hi flyfloater and others
I think your prop shaft is 3mm. If so, props with a 1/8" drilled hub will fit but ,it will be loose. This can be improved by wrapping a layer of thin tape around the shaft. To start with I would look to the plastic Octura props . These would be The X431,Y531 and Y534. They are dirt cheap and of good design. Stiff enough to work well with good power. Likely to be a improvement over what you now use. Agood metal Oxtura prop would be a X435. Very efficient but cost much more. n.h.schmidt