tüfteln (ww):
klussen(en) to fiddle with something in an attempt to fix or improve it., knutselen(en) to fiddle with something in an attempt to fix or improve it., prutsen(en) to fiddle with something in an attempt to fix or improve it., sleutelen(en) to fiddle with something in an attempt to fix or improve it.
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Via: Memodata.com