Well if you don't have a magnetic base how about using a strong system of wood clamps / G clamps to hold the DTI in place?

All you have to do is make a rigid base so you get a decent measurement - just make sure you don't make life too difficult for yourself. You need to be able to reach the hub with out tripping over reinforcing struts.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!