That's exactly the instructions I applied for the scissors, using a blade backspring and a blade tang as the rest. I've done it a few times now and I find that it gives too much tension for my taste, so in addition I file off a little material (about 0.5mm) either from the backspring or from the rest. The backsprings were from my parts bin, so I couldn't say if they were from a Waiter, Tourist, Sportsman or Small Tinker but as far as I can tell they're all the same...