Not if it's to be used freehand as pressure switches are for safety of operator if you should slip and drop the tool it turns off.
My question/s
What tool?
How are you going to use it?
Is it a router you want to fix to your home made router table?.
Answer using the reply page to your question or re-post complete question with the further details.
BB
January 2011
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix general d.i.y.