Triggered by my posts #5, a high profile (in the web at least) flute teacher wrote to me privately, as follows:
"You wrote on Sax on the Web the post below.
Are you not worried about damaging the solder on the embouchure plate
by grabbing it?
I've seen several embouchure plates pop off, crack and/or bend from
students grabbing them."
Because other readers may be thinking the same thing, I offer the following reply in this forum:
I am only going from my own experience. I wrote as a very experienced flute repair technician, with considerable teaching and playing experience..
First, it should be said that the problem of extremely stuck head joints does not occur with silver flutes unless somebody has forced in a foreign head that did not fit in the socket. I don't think this is the case here.
The problem is extreme only when the joint has corroded badly while assembled. The only joints that corrode that badly are those that have the brassy look, most being student USA or British brand-name student instruments, such as Gemeinhardt.
Hundreds of times, I have grabbed a flute VERY tightly, around the embouchure plate (for more torque) when I am using the specialised tools for shrinking tenon joints. On some flutes, especially student ones, the tubing is very strong, and enormous twisting force is needed - much greater than that needed to remove a stuck head.
As I indicated, peeling the leather off the palm of my hand is a significant risk with the combination of forces involved, and the sharpish edge of the plate. For some flutes, there is no way, even with my strong hands, that I could get sufficient torque by holding only around the tube. The only way to hold it to get really high torque, is to use the bony part below the base of the fingers to push on the edge of the lip plate, in an action around the flute.
Because this is around the flute, there is almost no bending force on the lip plate. The only lip plate that could bend would be one that is of extremely soft metal, and I have encountered this only on the very cheapest and nastiest of flutes - flutes of a quality that you probably have very little to do with.
The various forces applied cause a sheering force on the solder, not a peeling or tension force. I can assure you as a qualified engineer, that a well soldered joint of the area involved can easily stand that much force.
As I said, the plate can come off - perhaps one in a hundred flutes, and that is because of poor soldering. If the soldering is that poor it should be re-done anyway, and this is an easy job, taking perhaps 5-10 minutes. It is no big deal on the sorts of flutes for which this can happen.
If the soldering is that poor, then it quite likely leaks, and should be re-done anyway. The plate may be held on largely by corrosion. That was common on Hernals flutes.
If it is true that you have students lifting plates off reputable brand name flutes, then I suggest that it is because of a quite different set of forces, that cause a peeling or tension force on the solder, rather than a sheer force. Inadvertently jamming a finger under the lip plate could do this.
Even so, there would most likely have to be a fault in the soldering for this to part. I, too have encountered bent lip plates, and forcing them unbent has very rarely been enough to part the soldering, even though the forces involved are ideal for parting it.
I don't recall having this problem with the hundreds of students I taught, but yes, as a technician I have come across a few. It probably happens from knocks, that a player is possibly reluctant to admit to, or pushing the far side of the plate very hard towards the tube - pretty hard to do with the fingers while removing a tight head!
Perhaps the built in safety of my procedure is that I use my bare, soft hand, and do not wrap leather or something else around the head.
"I've seen several embouchure plates pop off, crack and/or bend from students grabbing them."
Crack!!! Really, that is rather far fetched, IMO. The metal is really tough. Tough enough to have been stamped to shape from a piece of sheet metal. It takes a huge amount of repeated bending before cracking. There must have been a serious flaw in the metal, highly unlikely in sheet metal. Perhpas the plate was cast - poorly. I know chimneys are ofen cast, but are plates cast? Was the flute made in India?
There is
some risk with
any procedure. A technician is only as good as he is at managing these risks and being able to deal with the situation if it goes wrong. A DIY person generally knows that there are risks, and that if things go wrong he will need to seek a professional. I think that is pretty much understood by the many DIY guys in this forum.
As I have said several times in this forum, the success or failure of any repair procedure - be it on musical instrument or any other item - is usually in the detail. Readers attempting their own repair work should always be aware of that. If in any doubt, of course they should take their instrumnet to a technician.