NavList:

A and B are not eyepieces they are objective lenses, c and d are eyepieces one tube must slide into the other to focus them. The eyepiece with the smaller lens is higher power, the thing threaded on both ends is probably a multiplier which gives two eyepieces two more magnifications to work with. The flat brace thing with the hole, probably is used to replace an objective lens on its tube?? that way it could be used as just an open tube for daylight use when no magnification is required. It takes an objective and an eyepiece to make a telescope..... :)

Let me know how it turns out.