I bought two wood props. a 22x8 and a 23x8. I drilled the holes out on the 23x8 with no problems. But the 22x8 had a larger centering hole, most likely a defect during production. The hole is so big that the drill jig would wobble pretty bad in it. So I tried wrapping tape around the jig until it matched the size of the hole. Even doing so, the bolts holes won't line up with the engine (DA50). So from here I say the prop is junked. I called up TBM and talked to a guy about it, he said to use a bigger drill bit until I got the holes big enough to mount to the engine, and wrap some tape around the crankshaft. He made no effort to offer a return, I mean it's only a $21 prop! So all in all it's not really that big of a deal, but this dude essentially told me to jerry-rig the prop to MAKE it fit. I'm sorry but I'm NOT putting my $3000+ airplane in the air with a jerry-rigged prop! So needless to say I'm not the slightest bit impressed with Troy Built Model's customer service dept. I guess I'll have to buy my 150cc yak elsewhere.