Having recently acquired an Olympus FL-LM3 for use on a mk3, I thought that it should work on a Panasonic GX8, as it has the same contacts.
Unfortunately there is a slight difference in the hot shoes of the two cameras. However, a very minor modification to the flash, involved the removal of some plastic from the front of the hot shoe allowed the unit to be pushed forward far enough on the GX8 to engage and function completely correctly.
The yellow line is where the excess plastic was removed


Unfortunately there is a slight difference in the hot shoes of the two cameras. However, a very minor modification to the flash, involved the removal of some plastic from the front of the hot shoe allowed the unit to be pushed forward far enough on the GX8 to engage and function completely correctly.
The yellow line is where the excess plastic was removed

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