I've had my TB off about 20+ times, i only replace the gasket when needed, there only paper and i always leak test it when it goes back on, other gaskets like turbo, manifold etc.. i do replace each time.I haven't had one fall to bits yet, just be gentle with them.

Take off your TB, if your polishing your Manifold, chances are the TB will take a knock of something.
 
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Saying that I took my TB off and gave that a go at too, it's cast and not easy to work on and fiddly, but looks better than it did, be sure to mask it up tho you don't want swarf in ya TB

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This was done with a dremmel then a few small flapper wheels and polishing tools in a drill.


Sent from my IPhone when I should be doing Work!!