Compatibility of products and replacement brushes:
All our refill kits have a 8/32 Male thread (previously M3 or M5)
This is a change to previous years, where the threads were different from one kit to another, so that we could make a rod compatible with all brushes.
We decided to include an adapter during the thread transition period for those who purchased our kits with the old threads.
This adapter will be inside the boxes of brushes for a period of one year.