Warming up the area around the concave on the parts may help.
Warming up the parts with a hair dryer may make them easier to be removed and attached.
In addition to using a hair dryer, immersing the parts in warm water of about 40°C for 15 minutes may also improve the assemblability.
*Be careful not to burn yourself.
*PVC material will not melt or break unless it is heated to a very high temperature.
Example: Warm up the circled area if the hand part cannot be removed.
If you are still facing any difficulties after trying the above methods, please check the following article and contact us using the inquiry form.
・What to do in case of defective products