Use Vaseline and lube the neck that will go into the rubber. Vaseline will not hurt the rubber and help it slide in place better. I know that sounds bad, that should help.
On a side note, you can use Vaseline on any rubber gasket (rub onto gasket) and set it out in the sun for a few hours and it will swell up also allowing a better fit if the gasket has shrunk over time.
Last edited by Just4fun1991; July 21st 2021 11:39 am. Reason: error & added