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--- This way they might have been able to do with a smaller diameter spindle. That last statement is a little weak for me as I don't see why, if spindle was of questionable strength, why not just make a bigger spindle. Only the brits would know! yet assuming that the spindles were not purpose built for just the Healey, maybe they could do with some strength enhancements. ------
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Exactly -- The AH was built to a very tight budget. The spindles from the Austin A90 sedan were adapted to the AH to save money over purpose built parts. As was the original engine & many other parts. Using the sleeves in compression is a clever way to increase the spindle rigidity/strength.
Other cars with relatively larger spindles in proportion to car weight or intended use, whether purpose designed or by luck, do not need this strengthening.
D
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Interesting way of doing business, don't you think?
The spindle was necked down even further with the BJ8 model (smaller I.D. outer bearing), presumably so that a thicker cross section wheel spline could be adapted when going from fine to coarse threads.