I missed the "noses" that hold the battery holder in place. Glued in 2 carbon fiber rods with a diameter of 1mm, which protrude about 1mm. Now it works.
very good from chris on 31/08/2019
Works and fits perfectly. The new springs are good and look nice. The only "negative" thing is that the surface does not match to the rest of the calculator. It's not bad but one can see the difference. But hey.... it's on the backside and I want to use the calc, not put it in a showcase :-)
5 stars from Tom Y. on 05/07/2019
it fits! For my calculator that is 40 years old, I am glad that someone still takes the effort to create replacement parts.