Vou me informar melhor, mas tenho quase certeza que o Micro Switch OMRON D2FC-F-7N(10M) deva servir de boa!
http://www.ebay.com/itm/2Pcs-Micro-Switch-OMRON-D2FC-F-7N-10M-For-Mouse-New-/261314215088?pt=LH_DefaultDomain_0&hash=item3cd78a7cb0
http://www.ebay.com/itm/2Pcs-Micro-Switch-OMRON-D2FC-F-7N-10M-For-Mouse-New-/261314215088?pt=LH_DefaultDomain_0&hash=item3cd78a7cb0