I do love the Contex calculators - they really are the most bonkers machines. We have a model 10, which, like yours had the issue with the friction material in the pin matrix disintegrating - I did the rather involved job and replaced the perished foam with new foam. It's not the easiest job because the pin matrix is riveted together, but there was just enough metal to grind a bit away to open the matrix, replace the foam and then re-crimp the metal tabs. The semi automatic multiplication on the 30 is really good, I like that a lot. Favourite of all is the fact you have to write down the digits as you perform a division - I quite fancy adding a 30 to the collection now I've seen yours, cheers Jaap.

@halloweenengineer6283

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I was waiting to see what button needed to be pressed to make all the numbers show up after the division finished, but nope! Gotta keep a notepad handy there.

Thanks a lot for this video 😊😊

That’s an awesome machine.

Thanks Jaap. Those troublesome Contex pinboards.

The industrial design here is downright peculiar--it looks like it's upside down.