Gravity feed bottle for Megablade reverse box

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Someone has told me about a gravity fed oil supply for a Megablade reverse box.  Now before you all tell me I should get rid of it (the car came with it fitted and it seems to work fine) I really can't be ar**d to remove the panel in the drivers footwell every few weeks to check it.

If anyone has fitted such a device, advice and pics would be most welcome  

Thanks,

Dom.