blackhawk 4 ton jack?

Do you have instruction on how to rebuild a blackhawk 4 ton fioor jack serial no. H205944 it leaks down, if so where to get parts.thank you Kirby L. whitworth.

I noticed in this 'ible,
https://www.instructables.com/id/Rebuilding-a-Hydraulic-Floor-Jack/
by PhilB, about him rebuilding an old floor jack.  In Step 1, he says he sent an email to blackhawkparts.com, and they were able to help him find the kit for his jack.

That instructable looks like it has a bunch of other links too, including other tutorials on rebuilding floor jacks, plus lots of pictures of the insides of Phil's own floor jack.