4-bar linkages issue

Dear all,

I’m trying to set up a mechanism in Visual Components using SASSA, but I’m having some issues.
The mechanism is composed of two 4-bar linkages: the quadrilateral on the right works well, but the quadrilateral on the left is not working properly because one pin does not stay in its hole.


The two quadrilaterals are the same, just mirrored, so the formulas should be the same. Where is the error?

I have attached the mechanism file:

testa 4.vcmx (105.8 KB)

Additionally, I would like to set link 1 to oscillate in a program. Is there an easy way to do it?