Help for Linn Isobarik speakers

I am the original owner of a pair of Linn's Isobarik speakers, purchased back in 1987.  They were in perfect working condition until last week when a painter moved them away from a wall and squashed the top tweeter of each speaker in the process (despite my earlier warning).  These speakers, once one of the finest in the world, were still proudly anchoring my second system and I would love for them to continue to do so.  I'm pretty sure Linn ran out of replacement tweeters long ago, so my question is, what is my best option for repair/replacement?  Sound still emanates from them, but it is obviously compromised.  Also, assuming there is an appropriate replacement tweeter out there, is this a job for which I need an expert or can a laymen, such as myself, do the job?  I'm pretty handy with a screwdriver!