[hihotte]

Holá Sergio,
the translation actually reads like: "Attention, move the right wheel (not both and not the left one) onto the rotation disc".
Does the translation not ring a bell in connection with the well known compass-calibration disc? But only one wheel? May be due to lack of space on the disc, especially if Ju52s also were calibrated there? Who knows more?
Cheers
hihotte