Like everyone else replying to the thread has said, yet the OP still refuses to do so. Of course, one could have 2 issues.

Or, perhaps the wheel was dished to compensate for bent forks, and flipping the wheel will center it.

The worst thing you could do, and you still don't have a diagnosis. Doing so, and the wheel will move, and probably bend or break the skewer. Plus, it would tend to amplify the problem at the pavement, not reduce it.

If the frame is bent, then hopefully you are the type of seller that discloses it in the ad rather than trying to cover it up somehow.

But, take 30 seconds to prove to your own satisfaction what is wrong with the bike.

We are practically begging you!

Agree that if you have a bent fork, dishing the wheel is a dangerous way to "fix" it. But if swapping the wheel orientation changes the wheel centration, doesn't this confirm that you have both a bent fork, AND a wrongly dished wheel?

Yes it does. If the dish is correct but the fork is bent, flipping the wheel won't do anything noticeable. If it reverses the problem (moves the wheel to the right side, then dish is the problem. If it centers the wheel in the brake caliper, then it's both problems.

Yes! And with much wringing of the hands and gnashing of the teeth with the angst and the frustration!

Oh my this is serious,,,,,please inform the buyer,,

I did it this morning despite being late for my appointments
I had a known good wheel I put it on and wow it's centered then I put original wheel other way round and it's dished the other way

See John, you're not so bad after all ,,,,,

So the frame is probably fine.
And all you need to do is either replace the front wheel or re-dish the front wheel.

You've got to pull it over by quite a bit, but dishing isn't a big deal if you're handy with a spoke wrench. If not, then perhaps it is better left to the professionals.

FINALLY, we have the answer many have been asking for right from the start
Only took 12 days

If I was buying your bike (you said you were going to sell it) I would want it exactly as is - without YOU trying to straighten the fork. Fietsbob showed a fork jig and that's what is needed, and in the hands of someone with some experience. There's only one shop with a proper fork jig for miles around where I am, and not many guys with the experience to do it properly. I'd rather take the bike with the bent fork and have my guy do it, rather than you start bending it in your garage. Just me.

Huh?

I thought it was easy to understand. I'd rather buy a bike with a bent fork (priced accordingly of course) than a bike with a fork that has been "straightened" by someone in their garage that doesn't know what they're doing. Just leave it alone and sell it as is. The new owner might want to replace the fork altogether, or have it straightened professionally without you messing with it.