Tsukemono - Wikipedia, the free encyclopedia
Based on the above info, I don't see why you can't just put the pickling vegetables into a container with a lid that is smaller than the container and just weight it down with any heavy objects. From the sound of it you are only trying to remove the excess fluid from the veges. It just looks like it is screwing down the lid into the container to exert and hold enough force to drain the veges.
When my mum makes tongue, she puts the cooked tongues in a pudding bowl with a saucer on top (one that will fit into the bowl) and put the weights from a manual scale on it. Similar principle for a different result.