• Loosen the hexagonal nut (it’s a locking nut, so you don’t tighten it to tighten the play of the secateurs)
• Undo the bolt, clean the separate parts - a great opportunity to sharpen really well
• Rescrew the bolt, and tighten to what feels right. This is how you adjust the play, with the bolt, not the nut
• Put the locking nut back on

In theory it’s easy but in practice quite tricky, as the nut can seize up - be sure not to slip and scuff it (or your knuckles) with the spanner. If it seems too daunting, select the Sharpening Service and we’ll sort them out for you.