limit switches

Anyone have a source for some good limit switches that are reasonably priced. I've been having problems with the 2 types of micro switches that I've had so far. I run them normally closed and vibration from the machine intermittently bumps them open and faults my geckos and wrecks my part. I've been just running with the switches disconnected and all works well. I found that if I wrap the machine with a screwdriver handle near the switches this creates the fault a lot of the time.

Thanks

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