Sorry, I have no desire to take them apart, I leave destructive testing to my brother, he seldom puts things back together...
They don't have external screws and seem to be folded aluminum put together by machine. That silver is extruded aluminum.
As I have stated, I think these work a little better because we use only the center of the light and not right to the edges.
Experimentation is never free, we always pay with time or money.
I bet my brother could sawzall any enlarger to fit with these heads.
ymmv
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