After reading Hilton Steve's post on his tool hight probe and how useful it was i thought id give it a go.
As i am a tad paranoid about driving my tool straight through the probe I also thought I would add a couple of E-Stop switches in parallel under the spring loaded contact

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looks posh :)
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simple :)
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should have grabbed a sharper tool :(
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the switches run straight back to my bob E-stop (iv not wired it up yet, ill feel much better when I do)... the washer makes contact to the brass contact through the spring

this could be made much lower profile as its a bit tall... i may have to have another go at this but for now ill see how we get on :)