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That wasn't my point though. If there are multiple people using them there needs to be a way of manually entering the number as having to wait a couple of hours between users is not realistic and we all know what our number should be.

There are three of us that use the rollers, so each of us has to do a spin down every time we use them. We all know what the number should be so would it be possible to modify the smartphone app so it can be directly entered or selected from a list of previously used ones?