Re: Help with door hardware on thin door
I agree with Giz, an exterior door should be at least 1-3/4". A door that is only 1-1/4" doesn't have enough meat left around the bolt for much security. Also, if you're replacing a thicker door with a thinner door, it will be fun trying to set the hinges and get the proper reveal.
You could adapt most knob style handsets to the narrower thickness fairly easily, but these thumb toggle style are a pain to install on a good day when everything is perfect, let alone have to try to do any kind of customization.
If you must use this door and this handset, then I would Install a piece of 1/4" material under the fixture on both sides of the door, kind of like a door plate. This will give you the thickness you need and keep the hardware lined up in the center of the door.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!