1. Calculate cheese harp height by measuring the height of your 8-10L pot. Add 100mm above the height i.e. 180mm (pot height) + 100mm = 190mm (cheese harp height)2. Calculate cheese harp width by measuring the inner radius of your pot. i.e. 240mm (pot diameter) ÷ 2 = 120mm (cheese harp width)
3. Cut two pieces of 16mm x 5mm hardwood timber to the harp length. i.e. 2 x (16mm x 5mm x 190mm)
4. Mark the pot height onto the two wood pieces with a pencil. Draw a line down the centre of each piece of wood – starting at the pot height line and going down to the bottom of the wood.
5. Drill a 5mm hole around 10mm from the bottom of each piece of wood, allowing enough distance to prevent the wood from splitting. This hole will hold a 5mm dowel to make the bottom of the cheese harp.
6. Using a pencil, mark every 5-10mm from the 5mm hole on each piece of wood, leaving the top 75mm of wood unmarked (for the handle). 5mm marks means the curd cutter will make 5mm curds and 10mm marks means the curd cutter will make 10mm curds – depending on what kind of cheese you like to make, you might like to make two curd cutters!
7. Drill 1.5mm holes at every mark (this is where the fishing line will go).
8. Drill another 5mm hole for a middle reinforcement – drill halfway between the base dowel and the 75mm line from the top. A second piece of 5mm dowel will be fitted here.
9. Calculate the cheese harp handle width: 25mm x 16mm x (pot inner radius mm – 10mm). Cut two pieces of hardwood to this width. i.e. 25mm x 16mm x (120mm – 10mm) = 2 x (25mm x 16mm x 110mm)
10. Cut two pieces of 5mm dowel to the cheese harp handle width i.e. 110mm
11. Prepare some 2-part epoxy glue and glue the wood together, dry over wax paper and ensure the sides are straight. Clamp together until the glue has dried. Once dry, pre-drill and add small round headed screws into the handles for extra strength.
12. Sand cheese harp down well, especially the long pieces.
13. Thread nylon fishing line back and forth through the holes. Tie the fishing line at the bottom and then pull each line upwards to tighten, then knotting the top.
14. Mix some 2-part epoxy glue and thin with a little alcohol (methyl hydrate) and brush all over the cheese harp, especially the holes where the fishing line goes through to prevent curd getting stuck and sealing the knots. When dry, lightly sand the wood (not the fishing line) and give the cheese harp a second coat.
15. Wash and sterilise harp before and after use.
Source: https://www.littlegreencheese.com/2013/02/making-your-own-curd-cutter.html