When the Sjopper-Kees has been in the sun for a long period of time or if it became very hot, it could deform.
This can easily be fixed by heating the deformed side(s) of the Sjopper-Kees with a hair dryer (3-5 minutes), on a medium warm setting at a distance of at least 20 cm.
After heating with the hair dryer, it is easy bring it back in the right position and then let it it cool off.
If the handle deformed, you can lay the Sjopper-Kees flat on its side with a heavy book on the handle.
The Sjopper-Kees will cool down within 15-30 minutes.