Pete - another thought, get a Leica disto and measure the current Johnny R setup very carefully, write it down so you can return to it after making changes !!!!
tape on floor is OK until the vacuum cleaner eats it !!! ask me how I know. The Leica is $50, best money I ever spent for setup
tape on floor is OK until the vacuum cleaner eats it !!! ask me how I know. The Leica is $50, best money I ever spent for setup