Never had a problem with TB but I know several who have....
Some delicious magnesium wheels on this website
http://www.historicparts.co.uk/Parts_contents.htm
On the Lotus Cortina front some of the Team Lotus Gp 5 cars (mk 1 & 2) ran on magnesium wheels and I have a number of still photos of them but although they look like Elan 26R wheels I'm not certain they are??
Infact on that website the new Brabham 4 spoke looks very similar to the 26R wheel and Brabham wheels did appear on the Boreham (Ford) built Gp 5 mk 2 that appeared before the Team Lotus mk 2's.
Any of this mean anything to anyone?
Serious anorak territory, needless to say...