Wacom One standard Stylus Keeps Unscrewing

How do i stop the wacom one standard stylus (light grey and white) from unscrewing consistently while i try to work? I recently requested a replacement and the pen is different to the one i had previously (wacom one stylus pen - Black and white) but works fine, However every time I use it the grey end unscrews and leaves it uncomfortable to hold while drawing. It doesn't seem to click into place and will sometimes fall off. Is there a way to stop this?