[quote name='Mr Bassman' post='265106' date='Aug 19 2008, 12:01 AM']To repair a crack in the top, the top has to come off![/quote]
Not necessarily.
I had similar cracks (considering size and the criticality(?) of the position) in my cheap and beaten-up upright. So my issue was similar to yours, in fact the luthier when he first saw it did the sums ... the cost of his fix (assuming taking the top off) + plus what I paid was more than an identical model bass that he had up for sale.
On that basis, to fix it it all, in a way that made economic sense, meant doing it without taking the top off. So that's what he did.
Shame you're not in London, I could point you in the direction of the guy that did the job.
Cheers, Andy