The shock at the end of the translation of the blade is quite strong. If nothing's done, something's going to break soon.

Springs, it needs more springs.

From the beginning there are two of them acting on both sides of the bungee holding screw.

It's clearly not enough.

One of the obvious place to put a spring is at both edges, but there's already a screw down there :

I didn't saw it before drilling because I was looking from the opposite side, but when the drill bit went to touch the metal, the noise made me understand that there was a problem.

As the washers are too wide for the 9 mm thickness of the plywood, the 35 mm film cartridge finds another use.

Shaped, drilled and ready to block a spring (with the sharp edge in the previously drilled hole).

Just like that.

Funny thing : I still have a few packs of that color slide film sheets, too old to give accurate colors, but interesting in cross processing, a strong cyan/green cast on the negative gives a weird color rendition. And they're going to be used to shoot with the lens.

Another one.

Drilling L profiles.

Adjusting the place with some double sided tape.

Tightly fixed with 4 stainless steel screws and nuts, as the shock is very strong, it must be sturdy.

Oops ! that 25 mm long screw is too long.

Not anymore.