Hi everybody,
I had a similar problem. My old 41cx begin working erratically one year go. Display went off but on again when pressing on the bottom left of the plastic cover. Opening it, I discovered that one plastic post (bottom left) was broken. I therefore use a similar trick than that reported in this post (using a little longer screw to get into the remaining thread).
So far, so good. But, one month ago, the machine stopped working completely. An inspection showed that three of the four posts were broken (I suspect that, at a point, I tightened the screws two much...).
In this case, there were no remaining threads and hence no means of assembling the two parts of the body
The only solution I could think of was making the screws traverse the two parts so that assembling could be carried out using nuts and bolts.
The bolts could be hidden in the holes which were holding the head of the screws on the backside.
A rough estimation showed that the head of the respective screws would emerge above the "Sigma+" "div" and "." keys.
There was an unknown however : since the main PCB cannot be removed, I had no idea of the damage(s) I could create when drilling the holes.
There was also the possibility that the PCB is a multi-layer one, so that the hole can actually break a buried connexion.
But since there seems to be no alternative, I decided to have a try.
I used screws with diameter 2 mm and length 18 mm (for the two bottom posts) and 22 mm (for the upper one).
The corresponding bolts just fit in the holes provided on the back side for the screw heads.
My first attempt was unsuccessful : no display at all when powering on
But then I discovered that the piece of plastic holding the battery connector was tilted. So I had to glue it.
I took the occasion to add another dose of contact cleaning spray - WD-40 - on the main contacts.
And YES !
The "Memory Lost" message I got at power on was the cheerest one I've ever had !
Of course, I admit that, from of purely aesthetic point of view, the operation is debatable.
But at least it works.
I would not recommend it unless there's no alternative. The probability of irremediably damaging the machine is high (I might have been very lucky when drilling the holes in the PCB..) [and of course, as usual "I should not be held responsible of any damage... " You're doing this at your own risks].
Anyway, I wanted to report this experience because it shows that when all seems to be lost, there's sometimes hope
Jocelyn