My thread adapters

[GAW9576]

       

These pictures show how the threaded adapters can be switched around for the 2 different size threads most common in SE razors. In the second picture you can see the smaller size thread. It can be screwed into a standard DE handle like this too and the smaller threads simply never engage or interfere with the handle thread. Also I recommend threading the adapter into the head first then attaching the handle to avoid the adapter getting threaded to deep into the handle. And lastly I never do this over the sink. I almost had one go down the drain once and learned my lesson.