There are two "in the body" isolators. The schmidt style as described and the single for area work which expands. The deformation from the the expanding style is greater than the schmidt tool.mirwa wrote:Bob how are you managing to adjust, have they revised the tool, mine simply, is a turned piece of white delron with two grooves for O'rings and a pressure hole, this is as purchased from Jeff.pied_piper wrote: I've only seen the wall deformation when the tool is adjusted to apply too much internal pressure. When properly adjusted, I don't observe that issue.
The schmidt tool can be tight sometimes. Deepening the slot and adjusting with teflon tape can make a proper fit without deformation. I had a friend measure the deformations, the expanding style tool can deform a tone hole substantially. The schmidt tool was deemed acceptable.
As for the foot joint situation. A foot joint can also deform the E tone hole (last tone hole on the flute body) Lots of factors involved here.
The point is, you get to know your tools, and once you are familiar with how they are behaving, if unhappy, you can switch to another isolation method. Individual plugs do still work. Isolating sometimes is what makes the difference.
Regarding the Pearl, It's my guess that those tone holes on that 765 are not the most level. Get the tone holes leveled out first and it will hold adjustment longer. Most people use way too many partial shims and this combined with a wavy tonehole is a recipe for instability of sealing, especially if the pads have been overly crushed.