Magnetic seam guides (in lieu of Post-it notes for keeping seam allowances straight and even) are also in the shop.
EDITED TO ADD: Can anyone tell me anything about using these on computerised machines? My computerised machine has its own sliding plastic seam guide, but I use the magnetic seam guide on the mechanical (industrial) machine.
And a new Clover needle-felting tool is in the hands of a gung-ho four-year old.... (!!!)
Safety guards, retractable needles and neurotic helicopter-parenting will hopefully make the difference between creative prodigy and (heaven forbid) perforated child.