Hopkins & Allen 32 revolver 1901

[dirty dave]

Hopkins & Allen 32 revolver 1901

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I need help putting together a old revolver for a friend.It is a Hopkins & Allen 32 revolver with Forehand 1901 on the barrel .Hinged frame .all together now but something is missing that holds the cylinder in.there is a small slot below barrel on left side infront of cylinder Can some one show me a picture what goes in this spot ?

 

[dirty dave]

Picture of part needed

The small part in front of cylinder hooks onto inside of cylinder but cant figure out what it looks like or how long it goes or hooks under barrel in slot???