Dear Mr R. Sole,

I think I know the answer to your problem!

You have missed the important point that with a new instrument or with new strings, there is always a "settling-in period". For instance, new strings will always continue to stretch for a little while before becoming stable. Famous guitarists like Stephan Grossman often accelerate this bedding-in period by pulling and "snapping" the strings against the fingerboard while tuning up, also with the mistaken idea that this looks cool on stage.

Only after one has let the strings settle to stability and allowed the tonewoods of the guitar to settle also (this may take a couple of years so the use of Elixir PolyWebs or Nanowebs or a similar quality coated string is advisable) should one apply superglue to the machine heads to hold the instrument in tune. As polyacrylamide glue is innately brittle, in fact a more professional result may be achieved with a good quality epoxy resin.

Yours sincerely,

Dr. Guitar