Ruler Foot Set. This foot is ideal to sew along a plexiglass ruler. Note: When using this presser foot make sure the 2mm reduction is active in the "sewing settings - hovering height" You can also adjust the presser foot height by reducing the presser foot pressure below 0. Lower the feed dog and use without dual feed Firmware Update. To use this product, make sure the most recent Firmware is installed on your machine. Visit the support section of your model to download the latest Firmware and step-by-step installation instructions Visit the b79. For b77 customers, please contact your dealer. to update your machine Scope of Delivery. Ruler Foot JR (1). Needle Holder (2) Installing the Ruler Foot. Update firmware according to «Firmware Update Step by Step» Switch the machine off and disconnect it from the power supply system Remove the presser foot holder Installing the Ruler Foot. Remove the needle and replace the needle holder with the enclosed needle holder Installing the Ruler Foot. Install the ruler foot Adjusting Settings. To raise the foot height further for use with thicker materials, set the presser foot pressure to below zero Adjusting Settings. Limit the hovering height of the presser foot to maximum 2 mm in the sewing settings for the «Needle Up/Down» button