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hello,
I think the only one I know is from Bubblescuba:
BBS M67 Swing Wet-Lens Adaptor M52 Thread /use OLYMPUS TG4,5 housing 804200047540 | eBay
Hope that helps
Patrick
Talked with them at DEMA and you can use the nauticam flip adapter with a step up ring. You just need to take the screws out. I have one that I used with my nauticam housing so I plan on using it with my tg.