By German manufacturer Prym; very easy: use a fine tooth pick or small but blunt needle to widen a hole in the corner fabric of a towel, then use the slightly thicker plastic plastic needle to widen the hole, and clip on the new hook:
- [Wayback/Archive] Clip on towel and cloth hooks, terry, white | white | 15 cm x 1.1 cm | 5 pieces | card | terry | 14012050/
- [Wayback/Archive] Clip on towel and cloth hooks linen, white | white | 15 cm x 1.1 cm | 5 pieces | card | linen | 14012060/
The linen/leinen ones are slightly cheaper than the terry/frottee ones:
