Don't you have (shouldn't you have) a "certified parts library" so you don't need to go through the process of studying which material is needed for a handle, use standard and pre-certified screws to affix them, which you already know won't come off due to vibrations during launch, and won't accidentally fuse once in space (https://www.quora.com/If-two-metals-touch-in-space-they-fuse...). Basically do it right, so you only do it once, like software libraries (in an ideal world). Unless you really really have a damn good reason to not pick an existing handle from the library.