Related Clues:
- Knot on tree inside trunk narrowed
- Hard ball or knot of wood
- Knot turning up in Aran knitwear
- Bump on a dial to aid gripping
- Burl in a tree
- Trunk knot
- Dash back after king left ridge
- Reversal of gross imperfection in timber
- Help for hand-tool gripping
- Lump of skin: hurry to conceal odd bits
- A tree knot
- Bit of metal texturing
- Rough edge given to tools to make them easier to grip