Replacement tweeters for Eyris 1
If any new readers are seeking the same advice, then as at Feb 2016, replacements are available from Real Electronics in the UK, 08452 307 747 - this info from the service line at Tannoy. £63.21 + VAT + delivery. Part no 7900 0621
Much of the advice above is not applicable to the Eyris, folks seem to be posting generic solutions.
Unbolt the hex bolts at the rear of the tweeter assembly. With a screwdriver or similar, push the threaded rods forward to move the front portion of the tweeter housing free from the cabinet. The amount of flexibility in the cables may vary, and some users may have to remove the terminal block (hex bolts again) on the rear, and remove the acoustic wadding to gain flex in the cables.
There are three terminals on the tweeter, with push-fit spade connections. Green for Earth, red/black for signal. Disconnect these, pull tweeter forward, remove threaded rods.
Reassembly is the reversal of removal. Ensure all cables go in same places, etc. etc.