Clay threader / Threading tool

With this thread, you can provide your clay jars with a screw thread. Fits the standard PET bottles or soap dispensers perfectly. IMPORTANT: Every clay shrinks during firing! You need to scale the tool according to the shrinkage factor of your clay to obtain a suitably scaled version. This will ensure that the lid will fit in the end. SCALING MATH: ( 1 / ( 1 - ("YourShrinkingRate" / 100 ) ) - 1 ) * 100 If your clay shrinks 14%: ( 1 / ( 1 - (14 / 100 ) ) - 1 ) * 100 = 16,28→ You need to scale the object 16,28% bigger. There are 3 different thread cutter with different rotations (see pictures).