DO THIS if you have a STIFF rubber strap! (Citizen Promaster Diver BN0151) 

OMG thank you for the tip, it's so much more comfortable now

Thanks man! My NY0040 now fits like a glove!

Nice. Thanks for the tip! 👍

Nice method!!! Thank you!!!

Okay, as an update: I just tried it and it worked fine! The strap feels definitely more comfortable. Just make sure you have a nice cup like the one in the video, because mine was more cone-shaped and the strap moved after applying the water. Thanks for this tutorial, dude!!

WOW, what a difference. Thanks for the video.

Dude I was just wearing mine today and thinking about how stiff it is! I read your viewer´s comment, but I was waiting for your video!! Will definitely share the link with anyone I see in the same situation!! Good one!!

Boiling hot water followed by cold water.. will your receptacle shatter? Wow. That was magic.

Hello. Can you please gift me the new Citizen Eco-Drive - Promaster Divers - 'UNITE with BLUE'. Thank you, much appreciated.