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Contact Crossman or one of their repair centers.
Crosman makes about 50 different '''RIFLES''' you need to state the model you are asking about. See the link below for Crosman rifle owners manuals
See the CROSMAN Link below.
See the link below for the Owners Manual for the Crosman 1077 air rifle
I had to go look at my Quest 1000x and could not find any hole in the sight, but my Quest is about 4 years old and Crosman may have added it to yours. Usually a sight with a small hole is called a peep sight. I have a notch sight on my rifle. The only other hole on top of the rifle is towards the back of the barrel and that is a Scope stop. Some scopes have a pin on the bottom pf the scope mount to place in the hole, this keeps the scope from moving when the rifle fires.
Crosman still has parts for this rifle. contact Crosman at the link below (Customer service) and order the parts you need.
Crosman no longer has parts for this rifle. However there are independent shops that repair older Crosman air guns. Crosman offers a free service to locate these shops. see the link below.
That is a question that has a 50/50 chance of each. You would have to state why and what you would be using that for.
Crosman does. see the link below for the parts list and how to contact Crosman.
CROSMAN 2100 You can find CROSMAN Parts and manuals at ( see the link below) This should give you a diagram on how to dissamble a crosman 2100.
I know of No Crosman BB GUN model V35C. However Crosman made a V350 BB Rifle from 1962 to 69. If this is the rifle you are asking about please post the condition of the rifle. ( excellent, good, fair or poor.) It was a push barrel rifle. Is it in working condition? Repost with the information.
See the Crosman link below.