The standard central insert supplied with the router elevator and other UJK router table insert plates has a 38mm diameter central hole. We are now able to offer a Phenolic replacement for this plus some alternative sizes so that the space between the cutter being used and the edge of the insert can be kept as close as possible. We offer a guide bush adaptor to enable the fitting of American/Leigh style threaded guide bushes. The stepped central hole provides a secure accurate mount for your guide bush when carrying out template routing operations or curved work.