I have a Tee Dee .15 Special Mk2 that's Schneurle ported but the Cox resemblance is all in the crankcase of that Profi which for all intents and purposes is exactly like a Cox, even down to the gold anodising and the screw on retainer to hold the plastic(?) intake surround. I suspect it's ball raced though unlike the Cox. Most of those Profis I've seen on Ebay have been the .74 and I've always had a hankering to get one. They're neat .