আশির দশকের শেষ পর্যন্ত তারা সফল হয়েছিল পর্যটকদের দ্রুত দ্বিতীয় তলায় তোলার জন্য।
They were then upgraded to conform to the present day regulations: the old machinery still provides the counterweight power for the dead weights, while the variable parts of the loads were driven by modern high pressure oil pumps and motors controlled by computers.