Chalet multi bird feeder sucker removal

Specifically got this feeder to place on my house wall,so need to remove the suckers,which according to the RSPB shop description,is an easy thing to do. Alas,not for me. Have tried pulling them quite hard,but have given up now,for fear of damaging the feeder.

Hoping there's someone out there,who's bought one of these and removed them.

Thanks,Colin