Following a disappointingly short run (though probably not bad for the price), my ZD-915 (purchased as a now-discontinued TS-1513 from JayCar, but also available from RhinoTools and many others) has developed a fault. I suspect it's just the heating element which has failed, so it's (hopefully) not an expensive or difficult fix, but it did get me wondering about improving it. The most obvious change would be the gun itself. Since Zhong Di seems to base their units on Hakko gear (or else they coincidentally fit the same accessories), I'm wondering whether it would be feasible to switch out the heating element for a Hakko unit. This would naturally be a higher quality unit and should provide a much longer service life. Further, would it perhaps even be possible to switch out the entire gun for either a Hakko 802 or 809, depending on which would actually fit, and get all the other benefits such as the revised heating assembly. Has anyone tried such substitution before, or is it even likely to work at all?