Hello. I fitted a SIP speedo which includes a temperature measuring device which screws into a special Spark plug washer.
I thought a better idea was to screw it into a cooling fin. (Best would screw it into the Head). I drilled a hole and a a gap in the fin next to it.
I bolted it up and discovered the 4MM bolt is in fact hollow and the sensor is right at the end. How? By snapping the bloody thing off and now weighed out £18 for another one. I Lightly tightened at the end using Locktite and tight as I dare go.