. Many of the domestic knitting machines contain a needle retaining bar also known as a sponge bar or sponge-bar. Passaps, Superbas, some plastic bed machines and some really old machines do not have a sponge bar. Check if your machine has one. . The sponge bar is a long metal metal bar that contains a strip of foam that holds down the needles. The needles will not knit properly without a sponge-bar in good condition. . The manuals do not seem to mention anything about the sponge-bar.  The sponge-bar on a Japanese metal bed knitting machine is found in a channel near the front of the machine.  You need…