I'm planning to buy a stringer soon and I watched one video so far but the music was so loud that I turned off the volume on my computer. Videos with a slow and calm pacing would be ideal. Also, I did a search about wax, because I have heard people suggest waxing the mains when doing natural gut. Is there a certain type of wax that people use? I assume beeswax is the kind that's generally used. But there is also candelilla and carnauba, for instance. Is it a good idea to use wax for some multis, like Dynamite – to avoid damaging the outer layer? Does the use of wax cause trouble, such as by leaving residue on machine parts? Or is the wax applied so that strings with wax on them won't come into contact with parts where a buildup would be an issue? Also, I noticed that Irvin said pre-stretching polys is unlikely to help them maintain tension, but Tennis Warehouse's string testing database shows the pre-stretching greatly improved the total tension loss statistic for polys as well as for other strings -- at least for the time/tests involved in TW's "total tension loss" test. For instance: Polyfibre Viper 17/1.20, 62 lbs, Fast, no, 32.0 Polyfibre Viper 17/1.20, 62 lbs, Fast, yes, 23.2 Prince Tournament Poly 17, 62 lbs, Fast, no, 26.2 Prince Tournament Poly 17, 62 lbs, Fast, yes, 17.2 Prince Topspin w/ Duraflex 15L, 62 lbs, Fast, no, 9.9 Prince Topspin w/ Duraflex 15L, 62 lbs), Fast, yes, 3.7 Pacific Prime Natural Gut 16L, 62 lbs, Fast, no, 7.7 Pacific Prime Natural Gut 16L, 62 lbs, Fast, yes, 2.2 One weird result: Solinco Revolution 16, 62 lbs, Fast, no, 24.7 Solinco Revolution 16, 62 lbs, Fast, yes, 26.7 I wonder if that's an error in the data? Someone else said pre-stretching more than 10% can damage a string's performance by robbing a string of its elasticity. Is there any proof for this? Also, wouldn't the maximum pre-stretch threshold be different for different string materials/constructions? Someone else said polys shouldn't be pre-stretched at all. A pre-stretched string holds its tension better so given two string jobs at the same reference tension the string bed will feel harder in the racquet with pre-stretched strings. But isn't that just a matter of increased tension? Could a stringer not just cut down the reference tension and achieve a similar stiffness to the not pre-stretched string bed but achieve tension maintenance?