It is important that you use a high quality German wick in your German and Swiss Kerosene lanterns. American made wicks are not the proper thickness and you will most likely have issues feeding the wick up into the burner.
I purchase my wicks from HYTTA.DE which is based in Germany. The company not only has wicks, but most things related to Kerosene including oil lamps and stoves.
CHART OF WICK SIZES FOR ALL FEUERHAND MODELS
INCLUDING THE LINIG SIZE
Dochtmaße
Bez. - metr. - inch
10''' - 23 mm - 7/8"
7''' - 15 mm - 5/8"
5'''- 13 mm - 1/2"
3''' - 9 mm - 3/8"
1 ½''' - 4,5 mm - 3/16"
Verwendungsübersicht Feuerhand nach Typen-Nr.
Nr. 75 Atom - 1 ½''' -linig/ 4,5 mm
Nr. 175 Superbaby - 3'''-linig/ 9 mm
Nr. 176 - 1 ½''' -linig/ 4,5 mm
Nr. 176Lu - 1 ½''' -linig/ 4,5 mm
Nr. 176 Superbaby Special - 3'''-linig/ 9 mm
Nr. 201 - 7'''-linig/ 15 mm
Nr. 202 - 7'''-linig/ 15 mm
Nr. 223 - 7'''-linig/ 15 mm
Nr. 225 Medium - 3'''-linig/ 9 mm
Nr. 227 - 7'''-linig/ 15 mm
Nr. 235 Medium - 3'''-linig/ 9 mm
Nr. 252 - 7'''-linig/ 15 mm
Nr. 257 - 7'''-linig/ 15 mm
Nr. 260 - 10'''-linig/ 23 mm
Nr. 262 - 10'''-linig/ 23 mm
Nr. 270 - 7'''-linig/ 15 mm
Nr. 275 (Baby) - 5'''-linig/ 12,5 mm
Nr. 276 (Baby Special) - 5'''-linig/ 12,5 mm
Nr. 277 - 10'''-linig/ 23 mm
Nr. 280 - 10'''-linig/ 23 mm
Nr. 282 - 10'''-linig/ 23 mm
Nr. 305 - 7'''-linig/ 15 mm
Nr. 323 - 7'''-linig/ 15 mm
Nr. 327 - 7'''-linig/ 15 mm
Nr. 405 - 5'''-linig/ 12,5 mm oder 7'''-linig/ 15 mm*
Nr. 423 - 5'''-linig/ 12,5 mm
Nr. 427 - 5'''-linig/ 12, 5 mm
* die Nr. 405 war mit beiden Brennergrößen erhältlich