Ce genre d'outil est à se faire soi-même, par cintrage et/ou soudure...
On peut trouver ça aussi chez les guitares Larrivée, qui en vendent, je crois, mais vérifier les dimensions...
Personnellement, je ne pense pas qu'il faille toucher au truss rod à la légère. A la rigueur, pour celui qui y est habitué, 2 fois par an, dans un sens et puis dans l'autre, peu après l'allumage ou l'extinction du chauffage central... Mais sur une Lowden, le manche multiplis ne bouge pour ainsi dire pas. Ce serait plutôt la table qui peut réagir à l'humidité/sécheresse ambiante.
Et si vraiment on veut modifier le réglage, on détend les cordes pour introduire une clé allen normale et donner 1/4 ou 1/2 tour, puis on retend et on évalue...
Lowden a choisi de planquer un peu l'accès au truss, et comme ils disent : "we recommend that a professional technician make these adjustments".
Et aussi (copié de leur page http://www.lowdenguitars.com/maintenance:
"NECK PROFILE AND TRUSS ROD ADJUSTMENTS (RECOMMENDED SETTINGS)
Before having a string action adjustment it is important that the neck relief is checked and corrected if necessary.
First check neck relief: To do this, press bass E string onto 1st and 13th frets simultaneously and observe the tiny hairline gap between the bottom of the string and the crown of the 6th fret- this gap is the amount of neck ‘relief’ For most playing styles relief should be between 0.15mm and 0.25mm. If the relief is too large the action may be too high and/or buzzing may occur when playing around the 5th to 10th frets. If the neck is too straight, the action may be too low and buzzing may occur when playing 1st to 4th frets. NB: It is very common for new guitars to develop a high playing action during the first 6 months as the string tension begins to take effect. Often the truss rod will need tightened in new guitars after a few months to correct neck relief and action. If neck relief is less than the above measurements ( ie; almost straight or even slightly convex ) then the truss rod needs turned anti-clockwise using a 5mm allen key. While string tension has been slackened off, turn the truss rod adjustor (located in the internal neck block approximately under the 16th fret) a little at a time and re-tune until the correct neck relief has been achieved. (note, doing this will likely raise the action and therefore it may be necessary to lower the bridge saddles afterwards.)
If neck relief is too much (ie; the neck is more than 0.25mm concave along its length) then the truss rod should be turned clockwise until the neck has straightened sufficiently. Doing this will lower the action and it may be necessary to raise the saddles afterwards.
NB: Lowden guitars made between 1976 and 1993 and from 2004 to date have been fitted with single action aluminum channel type truss rods. Lowden guitars from 1994 to 2003 were most often fitted with a dual action truss rod. For these, there is a “mid-point” of adjustment where the truss rod is neutral and where the adjustor will feel slack."
Une fois le réglage satisfaisant, s'efforcer de garder la guitare dans un environnement entre 45 et 55% d'humidité relative, en craignant surtout la sécheresse de nos mois d'hiver
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