LDM - yes I am a little concerned about that issue, however, I_fly and Da Rock have stated in another forum that they have similar planes and that these units have handled the weight just fine. I did do a lot of research on these before buying, but I'm still nervous about it. I did not have luck with the FMS units, and I chronicled my experience with them in another thread on the FMS rotating retracts. Anyway, I do have them working right now, and they are lifting the FMS struts along with the Robart 3 3/4 in scale wheels, and they are handling that weight very well. This fact, in addition to the other guys' comments gives me a good feeling about these retracts. Time will tell...