Z Axis lead screw replacement? - H2D

did my first cleaning of the h2d- and all worked great - except the front right lead z-Axis lead screw.

it has HORRIBLE burrs, and is poorly machined along with slightly bent (so slight that I don't think it matters). but the burrs, while not impacting functionality - are making it impossible to clean. I'm using a microfiber cloth along with those bike chain laces rope to clean.... and the right gear is straight up tearing the fabric apart... when I touch it... thousands of small jaggies scratching my hand (ripped through my latex glove too).

I ended up going with a nylon brush for now to clean that one... but what should take 5 min is now over 2 hours because of that damn flippin screw.
I'd like to replace it... but I don't see any where to buy a replacement.

Bambu's store doesn't seem to list the lead screws for h2d... and the wiki I couldn't find any instructions on how to replace them.

any help?