This should be a straight forward prop, but every time I encounter trays and glasses I get scared just a but. I normally encounter them as items that must separate but in my next production they must be attached and never move. I want to use a standard restaurant serving tray and put two water glasses and a water pitcher on them. All of these would be plastic. What are your best suggestions for affixing the items to the tray so they never move, even if upside down? Also what is the best way to attach a hand strap without it being visibly attached to the tray? Also need to know for a production coming up this summer. Maybe someone knows how they were done for the revival of On the 20th Century where they were swung around within an inch of their life. Thanks in advance!!!