Mr. Li*chō, Leaf Spring Arm, Made in China, Unbranded, with Spoon Handle, Screw Lock

Please note:
The leaf spring arm tailpiece cannot be adjusted.
It must be used at the physically bent angle it was shipped in, so if the height is not correct, the angle of the bridge saddle will become shallow, and in the worst case, it will be unplayable.
Since the specifications of Chinese parts are not clearly stated, you have no choice but to buy them as a gamble anyway. If the bend in the leaf spring part is shallow and the angle to the bridge saddle is insufficient, it will lead to a lack of tension.
I retrofitted this onto a Greco SG from around 1990, and it did become a bit loose.
As indicated by the ruler, the ball end comes to a height of about 1.3 cm from the body top.
The bridge saddle height was about 1.6 cm, and it was just barely playable.

This is a knock-off vibrato unit purchased from a no-name Chinese vendor on Amazon.
One of the tiny screws for fixing the cover is missing. This does not affect its functionality.
A notable feature is that the original spoon handle has been replaced with one that I specifically ordered from the US, resembling a Les Paul Jr. SG style.
It looks very cool.
There are signs of use.
I did not like the arm loosening, so I applied screw locktite. It should be removable by following the instructions for screw locktite, but I am listing it as is.
The original handle is also included.

Another point to note is that even if you install it for aesthetic purposes, as it is an arm, it will lower the pitch of the other strings when you bend them.
I disliked this and removed it.