Sinclair (ESP)

The ESP Sinclair vibrato system was made by ESP and used in the 1980’s. The Japanese 1987 ESP Catalogue spells it as ESP Synclear Tremolo. Earlier versions lock the strings with a hex screw on the saddles and later versions uses the Floyd Rose style that raises the block from the bottom hex bolt to lock the strings. There were versions with a pop-in tremolo bar, but there were alsow versions with a bar that needed a collar. The base plate on these tremolos are rounded (info taken from axebition)