Check the listing for details. E Bushing Insert Adaptor Leigh RTJ400 To Bosch RA1181. Condition: New. Listed at 8.00 USD. Insert ring is not included. This insert ring adaptor is for a Leigh RTJ400 e10 elliptical guide bushing to fit a Bosch RA1181 router table. As shown in the pictures, this adaptor fits into one of the the insert rings that came with the router table. Press the adaptor and your 2 inch insert ring together. Since it’s a super snug fit, press firmly with your fingers until flush surfaces are achieved. Install the e bushing in the adaptor hole. Snap the bushing/adaptor/insert ring assembly into the router table. Use the two pronged e bushing rotate tool to rotate the bushing/adaptor/ring unit until the number 5 on the bushing is at your 12 0’ clock position. This is the proper position to start cutting pin boards as per your RTJ400 instructions. Your welcome