Klenkes means "pinkie". Erecting the little finger (not the middle one) of the right hand is the traditional token of the people from Aachen, the Öcher. It reminds us of the industry of needle production which had been widespread in the region for a long time. Defective needles were sorted out from the assembly line by a typical motion of that finger. This part of the production process was called "ausklinken" - hence the word of the local dialect for that part of the body. Many Öcher having been doing this all their life developed a typical deformity and could thus be recognized by their crippled finger. Today, many decades after the decline of the local cloth and needle industries, you can still happen - let's say: in Katmandu - to spot two people greeting each other by holding up the right hand and showing their pinkie. Don't fear for their health, but you will instantly know where they come from.
If you happen to pass by N 50 37.816 E 006 17.245 on Sunday, 14th of September 2019, you will find some Öcher geocachers having a good time together and celebrating themselves and their hobby by an event - the Klenkes - held yearly and having also become traditional - as it has to publish some caches on the day of the event. -
To the cache: Draw a regular hexadecagon with edge length 16² m; one of its vertices, L, is situated at the listed coordinates, another one at those of reference point R. The cache is hidden at a third vertex F; the bearing from L to F is - surprisingly - 16°, but the distance is not divisible by 16.

Geometrische Knobeleien 16.0
Die Vorgänger dieses Mysteries findet Ihr hier:
Zum sechzehnten Klenkes konstruiert ein regelmäßiges Hexadekagon mit der Seitenlänge 16² m. Einer seiner Eckpunkte, L, befindet sich an den Listingkoordinaten, ein weiterer an denen des Referenzpunktes R; der Cache liegt auf einem weiteren Eckpunkt der Figur, F, und zwar von L aus betrachtet auf 16°, allerdings in einer nicht durch 16 teilbaren Entfernung in Metern.


Mille grazie a Colibrì! Al suo mistero GC70B65 - I poligoni regolari (sfortunatamente già archiviato) mi sono ispirato per la creazione di questo rompicapo che certo bisognava adattare alle esigenze dell'occasione e del luogo - a proposito un luogo dove la figura dell'esadecagono ha una certa tradizione, come si vede sulla foto titolare ...
Für den Beta-Test konnte ich wieder den Experten für diese Art Berechnungen gewinnen, nämlich
theluckyteam.
Er wies mich darauf hin, dass bei einer Berechnung im UTM-Gitter der Cache nicht auf 16°, sondern auf 18,4° liege. Ich selbst kann das mit meinen Tools nicht bestätigen; bleibt aber sicherheitshalber im DM-System.
Herzlichen Dank für die kompetente Begleitung!