Jims Machine JM-2320 Primary Chain Locking Bar Tool for Softail 18-UpA primary lock bar is key in locking the primary drive system on Harley Davidson motorcycles. JIMS lock bars are made from aircraft quality steel and plated in black oxide for corrosion resistance. The length of the bar is designed for solid engagement in between the engine compensating sprocket and clutch sprocket. Locking the primary drive is required for a wide range of service work including changing or removing the compensator nut, changing the