clumpy coffee grounds

Quick Answer A wdt tool is a handle holding thin stainless needles that you stir through dry coffee grounds in the portafilter basket before tamping, breaking up clumps so water flows evenly. On Amazon, checked November 5, 2026, a basic model costs $9.99 with 618 reviews, a 0.35 mm seven-needle version costs $19.99, and the…