Quoted from ForceFlow:

I ended up going with the flagpole hinge method. It did not require any destructive modifications, however I did need to get a longer release cable (bike brake cable) since there wasn't enough slack in the original cable.
The parts:
-1" diamater wooden dowel; Two pieces 5-3/4" in length. (sourced from lowes)
-Four flag poles: amazon.com link »
-50" bike brake sheath/housing and 60" steel cable (sourced from a local bike shop. Note that prices varied wildly, so you may have to shop around. One bike shop had a similar cable for $45 )
-(optional): Two short metric hex bolts; M8-1.25x16 (found at lowes in the specialty parts drawers). This is to avoid drilling the dowel and so that the bolts aren't sticking out several inches.
Cost:
1"x48" dowel: $4
Flag poles: $35
Bolts: $1.14
Brake cable & sheath: $14.45
Total: $54.59
The verdict: This was a fairly easy mod that didn't take too long to do--however, if you've never worked on a bike or replaced a brake cable, the difficulty level would probably go up a couple notches. Either way, it was a bit more than I would've liked to have spent. Right now I have the teeth of one pole mount locked up against the flat side of the other pole mount. In this configuration, the little teeth have been popping off if you try to apply force to the handle without loosening the wingnut on bolt holding the hinged joint together. However, it does the job and folds down without any problems.
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Quoted from presqueisle:

Just an fyi as it has been posted here earlier... You can simply stand on the Hf table and push/bend the handle down. Takes 2 seconds. You can then pull out the handle for storage if you'd like. Or go the fancy route for those looking for another project.

Quoted from lb1:

This one would work without the need to grind anything. amazon.com link »

Quoted from LTG:

4 bolts each corner - go to home depot and get new ones. The others are probably ready to go too.

Quoted from toyotaboy:

wow he's not lying.. this is a list of replacement parts and the caster wheels aren't on it (looks like you can only buy a replacement cylinder)
https://manuals.harborfreight.com/manuals/parts/In_Stock_Replacement_Parts.pdf
I measured the wheel.. Hub portion is 40mm wide, 100mm diameter, and has an M10 bolt
This replacement should work fine (bolt will have .5mm more total clearance because of the metric to imperial conversion)
https://www.mcmaster.com/2315T527/
You may want to buy a set of 4 so they match (plus these are rated at 400lbs each). Keep the stock 3 as spares just in case.
** Can a mod make this a sticky? **

Quoted from CrazyLevi:

These things are cheap. I too went through the “can I buy a new wheel?” Thing with harbor freight. I was kind of annoyed until I remembered I’d got over 10 years out of a lift cart I paid $120 for.

Probably easier to just buy a new one.

Quoted from the9gman:

think I'd just go to the surplus hardware store buy a set of 4 wheels and drill new holes .....how long could it take

Quoted from Pinball-Ike:

Couple pieces of wood on top of the lift platform? Like this mod?
https://pinside.com/pinball/forum/topic/modified-harbor-freight-lift-table/page/17#post-5718982