The TM8 was only manufactured from 1984-1986. Parts have not been available in around 15 years. The TM8 had HIlti's version of the Joacob's chuck. It tightened the opposite way from a standard chuck. It had a tendency to fall apart and come off.Hilti revised the chuck two to three times but eventually did away with it after three years.
You might be able to find one on Ebay.
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