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Thanks Peter! I took the chuck inside over night to get it up to room temperature. It turns much better. I can now turn it with one hand. The drill press still turns a little, but I can live with that. I find it strange that a high end(?) chuck cannot be used as intended in a cold shop.

Mine is brand new so I want to know exactelly what is wrong before taking it apart.

No, sorry. There are two holes on the ring but no set screws. There is one set screw on tve body itself. See Spiro-I https://www.roehm.biz/en/products/drill-chucks/spiro-series/

Thanks for the quick reply! There is only one set screw. It is on the body about one inch below the collet. Slacking it does not help. The jaws are already fairly lubricated. Turning the chuck feels as if the bearing was packed with thick grease. Michal

Hi! I bought a keyless Rohm Spiro-I drill chuck. The chuck is really hard to turn. I must use both hands and apply a fair amount of force to turn it to open or close the jaws. This is very inconvinient when changing bits. Is it supposed to be like that?