Right eyepiece for diopter adjustment is STUCK - Binoculars - Cloudy Nights

Right eyepiece for diopter adjustment is STUCK - posted in Binoculars: Sorry to make a quasi equal post, but Im not shure to have used befote the correct English terms: Ive received as s gift for a truobled bought on aBay an 8x30 Stèréò Légère binocualrs. The problem i that the right eyepeice (the one for correcting the dioptmeter adjustment) is STUCK. I cant see any screw on it.  I have just tried to spray some wd40 without any success. May someone help me saying how could I UNSTUCK

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