When performing a front fork rebuild you might find that your lower restrictor located inside the base of your fork leg cannot be removed or re-installed without a special locking tool This common problem occurs when you remove / install the lower retaining bolt only to find that your restrictor “spins” and cannot be removed or tightened The solution to this problem is using our proprietary thumb screw that is specifically designed to lock your restrictor in place so you can tighten or loosen the restrictor bolt located at the bottom (outside) of the tube This tool will also help you you index the restrictor so that your drain screw can be properly aligned and installed Designed by Classic British Spares, Inc and made right here in the USA each thumb screw is made from the ideal steel material that will not bend or shear under load Each thumb screw comes with a straight knurl pattern and cadmium plated to prevent corrosion and to also retain originality Please note that this thumb screw is sold each as pictured - works with 97-1499, H1499, 97-1061 & H1061 fork restrictors as used on triumph Twins from approx 1961-1967 Applications Application Make Model Year Front Fork Triumph Unit 350 / 500 (3TA / 5TA / T100R / T100C / Etc) 1957-1967 Front Fork Triumph Pre-Unit 650 (All Duplex Models) & Unit 650 (6T / T120 / TR6 / TR6C / Etc) 1961-1967 Instructions Click on the image above to download and print the instructions