Contact Crossman or one of their repair centers.
Kimberley Crossman's birth name is Kimberley Frances Crossman.
Samuel Crossman was born in 1623.
Abdiel Crossman died in 1859.
Abdiel Crossman was born in 1804.
Mervyn Crossman was born in 1935.
William Crossman was born in 1830.
George Crossman died in 1947.
George Crossman was born in 1877.
William Crossman died in 1901.
Owen Crossman died in 1963.
The model 400 was made between 1957 and 64. Crosman no longer has parts for them. However on their web page they have a repair locater that will give you a list of locations that still repair old air rifles and guns. Go to the crosman home page and click on "find a service center." See the link below. BTW: the model 400 is a pellet rifle not a pellet gun.