One end of a two-metre galvanized pipe is cut at an angle and a steel plate is welded on tilted about 45° (like a small hoe); a handle is welded on wherever it feels right. Four holes in the plate take two bearings (as close to one straight line as possible), a shaft goes in and the excess is cut off, then an adapter, clamp plate and small pulley are fitted. A bracket for the 775 motor is welded on; once cool, the 775 motor and belt go on, and a powered test shows it runs smoothly. For power, 18650 cells make a 3S5P pack with a balancing BMS, fitted into a box with input / output / gauge / switch holes cut in it; the charge input gets a CV/CC buck-boost module with charge management set to about 12.8V; the battery positive runs through the switch into a boost module set to 33V feeding the 24V 775 motor — more torque and more speed. The box is fixed to the tail of the pole, the output lead connected, a shoulder strap tied on and trimmer line fitted (soft wire for now). A test cut at the front door works well — lighter and quieter than a petrol trimmer.