My 54 Mk VI alto had tuning problems that were caused by the neck (I wonder if it was because it was an early model). So I ordered a copper alto neck from Karsten Gloger, and we agreed it would be a Cigar Cutter curve. The result is a total success: intonation problems are gone, and the horn has fabulous tone and projection. The neck is also very beautifully made, at a very reasonable price for something handmade. It took a bit of time, but the wait was more than worth it.