I have a fullnut HP41CV, SN 2427*******. I know from past openings that the innards look exactly as they do in the CL manual--i.e., I know I have the coil-edged thing providing contact which relies on the integrity of the screw posts, and all the pics look exactly as I remember things. FixThatCalc has worked on this unit before, but I know for a fact this involved largely reinforcing cracked screw posts and cleaning things. I am positive that all electronics are original.
I remember reading somewhere how one can determine one's HP41 can accept the CL board based on serial number, but I can't find the article or link anywhere.
Any guidance would be well received. I vaguely recall this issue being discussed recently.
Les