You want it nice and tight. What I did was use a long screwdriver. I put it through a tennis ball then put on the spool and then another tennis ball then clamped it in a vise.
I attached the protractor to the square pc. of wood and used a cotter pin as the pendulum. Align the left or right edge of wood with the cable and pendulum will tell you the angle
You have the chart above. Easy to make one. Square pc. of wood with a protractor attached. Put a pendulum at the top. Align the edge of the wood with the cable and the pendulum will give you the angle.
Going through that now. Bought a salt water boat with only 600hrs. State of the art flushing system. Now replacing the motor in whole from internal rust. I'd never do it again. Just my opinion.
For sale 600w Xtreme bilge heater. Factory calibrated to turn on when temperature falls below 40 and turn off when ambient temperature of 52 has been attained. Purchased new 11/22/08 for $ 430 and never used. Will sell for $250 obo plus shipping. Original box, receipt and paper work included.