Squeeze me clamps

You've probably seen these but Poundland are selling 4 clamps with flexi tips for a quid. Not sure how they compare to anything else as these are my first. The spring tension feels strong so I will see how they go as I don't want to buy a lot if they damage the balsa.

You can always use a piece of scrap to protect the wood.

I've got a few of the larger cheapy clamps and they can Suffer a fatigue failure just behind the pivot of the flexy bit where there's a sharp right angle moulded into the plastic. Usually lets go when clamping a large assembly and you're quietly doing something else in the workshop. Really makes you jump when it springs off.