Hi Maurice,
until I get clear explanations from an expert, I will probably experiment around a bit. Just not on antique toy steam engine. That is too risky for me and, in case of damage, unforgivable.
"Stoomwereld" is by the way an interesting side, about which I am about a year ago times gestopert.
I wonder what recipes Josef,Jean,Ernst,Georges and Ignaz were using, maybe these are lost secrets.
I have also often asked myself the question of which bruisers the old guys from Nuremberg and Göppingen used at the time. Someone should have asked 60 -70 years ago. At that time, some employees of the Great Nuremberg 8 and Märklin from Goeppingen were still alive. But that obviously did not happen. The interest was not there. Too bad!
Regards