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MWS chrome centre lock wheel spinners are made from the highest quality materials and are precision engineered to ensure an accurate fit.
These two eared spinners with Morgan logo are 8 TPI (threads per inch) and fit 42mm hubs. Two eared spinners can be fitted with a hammer or spanner.
A spinner should be fitted with the wheel jacked up off the ground so that the hub, wheel and spinner are all centralised.
Apply the spinner by hand and tighten 3 to 3½ turns; give the spinner a couple of taps with the hammer; lower the wheel to the ground and give the spinner a couple more taps.
As long as the hubs are fitted correctly then the spinners will self-tighten and lock as the car is driving.
If you hammer the spinners too enthusiastically then you will deform the thread of the spinner and the hub and they are more likely to work loose.
Over-tightening also means that if you ever need to replace either the hub or spinner then you will also need to replace the other part as the deformed thread of the old part will not fit with the new thread.
If your spinners keep coming loose then it is probably because the hubs have been fitted on the wrong side. For example, the left hub goes on the left-hand side of the car as you sit in it, not on the left as you look at it from the front.