Charlie, Once you have the pin into the sight and it is in the track of the key, then tap the sight down hard enough to lock the pin in the track and the sight. The pin should not move once it's locked in.
Charlie, Once you have the pin into the sight and it is in the track of the key, then tap the sight down hard enough to lock the pin in the track and the sight. The pin should not move once it's locked in.