Turning 41C into 41CV

[wojtek]

Many thanks to all for your responses. Really helpful.
For the time being I have another probem, both machines 41C and CV are inoperative now. In my old 41C the problem is with loose 2 nuts which fasten the smaller board to the main one. The same problem is in the 41CV (and certainly some other problems in this case). The threads on plastic pegs got worn. I tried to apply an old trick with a sewing thread coiled around the pegs, which worked fine some 10 years ago in 41C, but now it not helped.
How to repair it?
BTW the LCD in the 41CV seem to be OK.