Trim small yarn pompoms evenly

Match the yarn and tool

For a first attempt, use a pompom maker with clear instructions. Its stated size is a guide: yarn thickness and the amount wound affect the final diameter, as Clover notes. Fluffy wool fills the same tool differently from smooth cotton.

Have suitable sharp scissors and a strong tying thread ready. Test the thread gently before using it. Yarn that breaks as soon as it is tightened is unsuitable for the central connection. The visible pompom yarn and the tying thread need not be identical if another thread holds the center more reliably.

For a two-color pompom, divide the winding areas mentally and place each color deliberately. A short note of the distribution helps when making a second similar piece. The result still depends on the yarn and trimming. Exact duplication is unnecessary, but recording the arrangement avoids relying entirely on memory.

Fill evenly and tie before releasing

Wrap the designated areas according to the tool instructions. Distribute layers evenly instead of making only the middle very thick. Avoid overfilling; the tool must still close as intended. Keep the yarn and approximate winding amount consistent when making a matched group.

Cut the loops in the intended groove while the tool remains secured. Pass the tying thread around the center and tighten it firmly. Secure it with an appropriate double knot before opening the tool. Without that connection, the many short strands would fall apart.

Shape the ball from several angles

Release the pompom carefully and fluff it lightly. Leave the long tying ends for holding or attaching it. Trim projecting tips in small stages and rotate the ball regularly rather than working only on its upper face.

Inspect the side and underside. A simple paper size guide can keep you from repeatedly reducing the diameter. A thin patch cannot be filled by endless trimming; the next attempt needs a better distribution of yarn. Gently tug a few strands to check the center. A shedding pompom is decoration, not a suitable small component for a young child's toy. Attach it only where the object's function does not depend on this improvised connection.