![]() (*there might exist a better word for this).Īs for the length, unfortunately I did not measure it but that should be easy to obtain by placing any thin wire (ideally a less than 1mm thickness wire) inside the entire groove and then simply measuring the resulting length. The O'Ring sits in a 0.96mm width groove (bottom case) and is pressed by a 0.81mm width "protrusion"* (upper case). This small rubber ring is important to keep water away from the delicate electronics inside the watch. If you need new O'Ring for the water-resistance, I measured the thickness using a micrometer and the best bet* is a 0.85mm O'Ring (*see methodology below). Hopefully the other versions use the same Torx T5 screws (*other versions are: Runner | Spark aka Runner 2 | Spark 3 aka Runner 3). It's fairly easy to disassemble and reassemble the watch with the help of a small 2mm flathead screwdriver (to gently pry out the case and other electronics). If you are very careful, all you need is a Torx T5 screwdriver (T5 is the size) to open a TomTom Runner, which is the first version that comes before TomTom Spark (aka TomTom Runner 2*). (warning: lots of words and theory lacks in practicality). I'll talk about screwdriver needed and O'Ring (for water-resistance) specifications. ![]() Also maybe this thread can turn into a resource for repairing TomTom watches? So here's my contribution. I'll be waiting too for electroguy's reply regarding where to source the battery from.
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