barrels with tube fastening in 1470-80

[Philip]

Originally Posted by Patrick O.

Hoi Marcus
The bore hole is 17 mm and on the end close to the thread ther is a small hole and inside as far i can see there are groves

Thank you, Patrick, for all the info you have given us so far. Now about those grooves -- how many and when you shine a light inside, do they look straight or spiraled? Can you tell approximately how deep each groove is?

When you stick a rod down the bore, does it go all the way to the touchhole? Or might there be something inside that plugs it up before then?