I have designed a custom, robust, yet lightweight microphone mount for the Sony ILME-FX6 camcorder (it will also fit the FS5). It’s low cost and it replaces the existing microphone mount and provides a strong and flexible mounting solution for a wide range of microphones with very good vibration and handling noise isolation properties. It is fitted to the camera by unscrewing the two screws that attach the factory supplied mic mount and using the same screws to attach this mount in the same place (do not over tighten the screws).
This mount will take heavier microphones than the standard mount which is prone to becoming floppy and breaking over time.
There are two sets of mounting holes so you can have the microphone at two different distances from the carry handle to suit your individual needs. The microphone mount will not obstruct or block the MI Shoe as many other 3rd party mic mounts will.
You can order the mount from Shapeways where they are made to order in a wide range of colours out of a very tough plastic material with a textured finish. https://www.shapeways.com/product/JKWA72Y6T/fx6-rugged-mic-holder-fit-sony-ilme-fx6-camcorder?optionId=193365147&li=marketplace
This mount will take any microphone up to approx 32mm in diameter. You will need 4 “O” rings to loop over the slots in the mic holder to act as the suspension for the microphone. these should be 2 or 3mm thick with an inside diameter of between 28mm and 32mm (30mm recommended). The O rings will not be supplied by Shapeways, you must source these for yourself. These are very cheap and are normally available on ebay, from car spares stores, plumbing suppliers and DIY stores. If you can’t find the right O rings it is also possible to use elastic bands, but these don’t tend to support the microphone as well as O rings.