two on the outside and one in the middle on the tail piece,and on the guitar body the three middle catches
i also stretch my strings heaps by whammying before i lockdown.I also only change two strings at a time , tune stretch then lockdown and move onto the next two.It stops the tremello from going right out of wack.I dont know if that helps or if thats how youve got it set up,
Just recently i was having trouble with my tuning and i couldnt find the problem,my floyds been going great for years,I eventually found the problem the bolts on the neck had worked loose just enough to stuff it up all time.
that could be it unless youve got a neck through body.
keep on rockin