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This seems unreasonably expensive...
You ought to be able to buy a 3.3kva 110v transformer for what they're charging you in rental unless they're offering a 5kva or something a bit more hench... even at that a 5kva costs less than £200 so they're really going hard on you there...Ok... did a Google... try Brandon Hire instead... much better prices from what I can see and I've actually hired from them before and found them very good.
I wouldn't get het up too much on getting a beefy extractor either as you'd be better off to keep the floor wet while you're working. You'll use less of the consumables and it'll keep the dust down for you. A decent "commercial" wet vac will be fine, keep the hose on and the doors open.
Grinder £144
Dust extraction £52
Transformer £24
Cables and stuff £8 (automatically added with grinder)
Grinding blocks £? (give them a call to check)Total: c. £228+ consumables
You could probably forego the damage waiver too to be honest... you'd need to be extraordinarily cackhanded to break any of this stuff...
Happy grinding!
Ok, I called them.
You need the grinder, the transformer, and the dust extraction - that's:
Grinder £177
Dust extraction £145
Transformer £81
Cables and stuff £30
Grinding blocks £240
For a total of £673, plus the VAT gives us £807, and then we need to add the damage waiver.