I have a <span class="headingb">TowerPro BM2409-12T outrunner and sometimes I'm having a bit of trouble getting the prop
correctly aligned on the shaft. It could be the nuts that I'm using or the thread at the end of the shaft...regardless of that, I wanna make sure I install it correctly.

Dont know if theres any other way to install a prop

nut - washer? - prop - washer? - nut
I screw on the first nut all the way to the end of the thread and tighten it (if its possible). Usually leave the first washer out so I can make the shaft as short as possible.

The first time I installed a prop on this motor, I didnt use the first nut and just tightened the prop against the motor hub,
later I realized that it was pulling the motor shaft and the washer at the other end was grinding against the bearing, so it was
losing alot of power. The benefit was still that I could do a nose landing and the shaft would be just fine. I mean these things are really soft, doesnt take much to bend them. Wish they would make them so that the thread goes all the way to the hub.....
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.....all tips are welcome

Thanks in advance

</span><span class="headingb">Edit: Are locknuts mandotory on a motor like this? When they wear out I've just used regular ones.</span>
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Backdraft,

Looking at this picture
http://www.elemodel.com/shopen/index...wt&goodsid=959

My experiance is to do what you did. 1 nut all the way down to the end of the threads, let the molded hex shap in prop hub sit on the first nut. Add a washer and the last nut.

I've never had a nut back off so a lock nut is not required.

Not really a right or wrong thing, just what works.

A washer on the front and back of the prop might allow it to slip and lose power.

HTH YMMV

I'm using APC-E props so the prop hub is round. Just bought 10 of them
Well they worked fine before, just gotta get em real tight.