Janome Base Rubber Foot which fits over the adjusting screw on the listed models below
Janome make many different types of base rubbers, please make sure you are looking at the correct type
GD8100, 2030DC, 4300QDC, 5270QDC, Jem, JG+, XL601, TXL607, DKS30, 8050, DKS100, MXL50, 5100, 5060QDC, M200QDC, M50QDC, 230DC, M100QDC, 780DC, GD8100, 2030DC, 4300QDC
Genuine Part No. 639005003