Product review (5 stars): Genuine GE Washer Hub Nut
I bought this hub nut as a replacement part when replacing the mode shifter assembly on my 7-year-old GE profile washing machine.  The part  was a genuine GE replacement part in the original GE packaging.  The cost was substantially lower than my local appliance parts store.

Note that this nut has a backwards thread.  You loosen by rotating clockwise and tighten by rotating counter-clockwise.

If you are buying this part, the one thing I recommend highly is that you buy the TB123A spanner wrench:
<a data-hook="product-link-linked" class="a-link-normal" href="/Clothes-Washer-Wrench-w-Adapter-TB123A/dp/B0021UYG66/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Clothes Washer Wrench w/ Adapter - TB123A</a>

This is a $12 part on Amazon, and it helps you cleanly remove and install the nut.  I used penetrating oil on the threads, and with a couple of very hard whacks on the spanner wrench, my hub nut was loose in about 1 minute. The TB123A wrench so cleanly removed the hub nut, it allowed me to re-use the original nut and save $8 on a replacement. This was totally worth the cost of the wrench.

I was skeptical that I could buy appliance parts on Amazon, but this turned out to be a great experience. I got everything I needed to fix my washer, and saved at least $300 on my repair. Thank you Amazon.