有助於

有 = 𠂇 + 月 : Mnemonic symbol: confetti.

In an act of revolution, with a pair of scissors (𠂇) Maud Younger (y) is cutting a paper moon (月) into tiny pieces in the outhouse's living room (ou3). There is (有) only confetti (有) left over.

助 = 且 + 力 : Mnemonic symbol: water wings helping you to learn how to swim.

Julian Giant Squid wants to learn how to swim and put on a lot of floaties in the space station's bathroom. As he hits the power button to inflate the high tech floaties remotely he forgot that there are still a lot of floaties left, stored in the shelf—he is reminded instanlty as also all of them inflate.

于 = 亅 + 二 : Mnemonic symbol: prepositions (in, at, on, to, ...) are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.

Yu the Great (于) was assigned to repair the electronics of the space station's kitchen (Ø2), but instead he was snacking honey from a honey jar (于). Unfortunately his capacitor (二) got stuck in the honey and now he has to use a crowbar (亅) to lever it out.