Electronics > Repair
Solartron 7061 7.5 Digits Multimeter Teardown and Repair
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Kurets:
The key blank I used was a Silca RO21, this is available from Ebay and is a profile/length match to the one used originally by Solartron. The attached picture shows measurements on a picture of a genuine key. I used only the measurements from the picture along with the paint+try method for checking interference in the actual lock. In the end I got a working key within about 1-2hrs of elbow grease.

I could not find my spare blanks today, but this link has some in stock in Germany:

https://www.ebay.co.uk/itm/254721466397
factory:
There seem to be some switch keys available online as "Ronis 601 switch key", that look very similar to the key I have, no idea how close they actually are.  :-//

David
unseenninja:

--- Quote from: factory on December 05, 2024, 08:24:47 pm ---There seem to be some switch keys available online as "Ronis 601 switch key", that look very similar to the key I have, no idea how close they actually are.  :-//

David

--- End quote ---

I think all these keys are identical. Given the very clear pictures here, Kurets' measurements and identification of the exact blank needed, I'd say the bottom just fell out of the eBay seller's market. A set of needle files, a blank and a caliper is all that's needed to create one of these keys.

I've picked these locks before and they take about ten seconds with a simple rake, so it's not as if the key requires micron tolerances.
Kurets:
Indeed, the key is low tolerance and the profile of the blank is very common. This site lists more alternative part numbers for the key blank: https://www.aldridgesecurity.co.uk/silca-1697-silca-ro21-to-suit-ronis.html and depending on your country one or another may be more available.

When I was making my key I actually had the turning direction of the lock wrong for a while, so I very much over-filed mine but it still works well. So as long as you have patience, and maybe one spare blank in case you make a mistake, there should be no reason to not have a cal-key  :D. I added a picture of my DIY key, which is clearly not quite the same as the genuine key.
kblue:
Thanks for all the input! Ordered some keys (-:

The final step would be to find someone here in GER to do a alignment + cal. I know my unit is a bit out of spec with a single known source (measured with a 3458A). Sadly every ... single ... range ... needs to be aligned separately.
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