The SPA Telescope


15. Cut Rocker Box Wood


Find tube balance point with all optics in place, including eyepiece. Cut sides of rocker box with vees, allowing at least 25 mm clearance at bottom, plus thickness of plank.

Cut two pieces of plank 5 mm wider than tube diameter. Drill hole for pivot bolt in the centre of one.

16. Assemble Rocker Box


If desired, edge vees with iron on Contistrip material.

17. Make Plinth


Cut 30 cm of plank for plinth; mark centre and scribe 50 mm radius circle. Mark out 60 deg positions with compasses at same radius; press in dome headed drawing pins or tacks at 120 deg positions. Fix three blocks of wood underneath for it to stand on.