tinker with (或 tinker about with,tinker around with,tinker at,tinker away at)

• 拨弄，摆弄；瞎摆弄；笨拙(或胡乱地)修理(或修补等)：

  Stop tinkering with that clock and take it to the repair shop.

  别摆弄那只钟了，把它送到修理店去修吧。

  He was tinkering away at the broken machine.

  他正笨拙地修理那台坏机器。