I’ve noticed on a bunch of Andreas’ chanters there is a screw near the back D. I assume this has to do with tuning, but could someone give me a bit more insight? Thanks!
I have the screw on my Rogge Narrow bore C chanter and Wide bore D Chanter but not on my Rogge B chanter.
My D Chanter came with the screw turned all the way in the High D hole and have not moved it. The C chanter has screw in a wee bit.
The screw is very handy for tuning a reed with a sharp high D by turning screw in the D hole will flatten hole and out a bit will sharpen the note.
Robbie Hannan, Sean Og Potts “Rogge B chanters”, Tom Clarke “Rogge C Chanter” all have the tuning screw.
Cheers
Ferg
I have the screw in my poly D chanter and had it in my narrow D chanter, and I thought and think that it’s a very handy gadget.
…and other pipes come fitted with a piece of tape on the back D hole, to be moved according to sharpness/flatness of the note
How much extra did you have to pay for your piece of tape, then? 
djm
The back d screws are indeed “handy”. They may or may not look better than tape, depending on your tastes.
But consider:
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some folks find the screw gets in the way of their thumb (I didn’t, when I had one of these); of course tape can be annoying too
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the screw, in order to minimize its effect on the bore, must be inserted with only a very thin bit of wood on the player side; I’ve seen cases where the chanter was damaged here, presumably as a consequence. The screw can even break through (though, it seldom does). It certainly weakens the chanter at this point.
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the screw may (will?) eventually loosen, and need to be held in place with a smear of wax or something similar.
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despite #2 above, the screw does, in most chanters, extend partway into the chanter bore; this presumably is not ideal, as it will affect more than the D
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adjustment requires a screwdriver or something similar, if your fingernails are too short or too thick.
None of these are stoppers, I suppose, but they should enter into your considerations.
regards
Bill
If the screw due to tuning is a bit or more outside the chanter surface a sharp edge of it can injure your hands or - worse - put ugly scratches onto the stock when you fold your pipes after playing - both happened to me.
Speaking if tape (which we’re not). I really hated using electrical tape as I found it got all gummed up and slid around. Maybe I was using bad tape. In any case, I switch to a piece of the blue painters which I found holds it stick, leaves no residue and repositions easily. You can just color it black with a Sharpie if you don’t like the looks of bright blue tape on your chanter. If you have a bright blue chanter, then you’re all set.
I’ve also played Rogge chanters with the back d screw and didn’t feel that it got in the way.
which I found holds it stick, leaves no residue and repositions easily.
That’s what is widely used by Highland pipers - in black of course 
You might wanna look for a retailer who sells such a tape: http://www.kiltsandmore.de/product,38_44,722,pipe_chanter_tape.html
Thanks for all the info!
Auto pinstriping tape is great stuff too. No gunk, stays sticky, comes in black.
I didnt get tape or a screw…I feel cheated! 