just enjoying some rosin, no hair straightener available so used hot knives, heated in a pan of boiling water.. got thinking could a pressure cooker + vac seal bags work for rosin? I suppose if the pressure cooker applies the necessary pressure and heat, could a packed parchment be placed into a vac bag and into the pressure cooker for extraction. Could make doing large batches less labor intensive.. anyone tried this? how about anyone with experience using an industrial size hydraulic press?