The HF or any of the similiarly built ones NEED to be reinforced before they are worth $.02. They will spring under very little pressure. I reinforced mine with 2"x1/4"wall square tube. Still not rock solid but more than adequate for most usage.
Next, drill and tap the 4 blocks the shafts run through and install grease zerks. Otherwise it wont be long until the blocks and shafts are wearing each other out.