Hi, I'm trying to understand the viability of making or having made - a hot -mould that can resize the neck of a standard cooldrink bottle. I want to reduce the neck of a 500ml bottle so that it fits loosely into another bottle's neck. So(ie) - to heat and compress the neck( threaded apperture) to reduce and compact it to form a new neck(without thread) that can slide easily into another standard, original apperture. I'm in Cape Town, South Africa, I don't know who to contact re designing or buying such a thing. Can you help?