You can also cut a strip of aluminum foil, apply spray adhesive to the back, then stick it on vertically up the inside of the hopper and down the outside to the metal casting. Then take one of the cheap wrist straps to ground it with (Amazon had some for, like, $3 last time I looked, but that was awhile ago). The wrist strap has a built-in high resistance that bleeds charges off to whatever you ground it too, so it doesn't spark.
If you want to go old school, drill holes for a dozen straight pins (the sewing kind) into the lid, set them in place and apply conductive copper tape to them that touches that aluminum strip on the inside of the hopper when you close the lid. The charge in the hopper and on the press will be conducted to the sharp tips of the pins and bleed off.
If you are not grounded, you can induce a static charge in the unit, so getting a wrist strap for yourself is a good idea in either case.