From: "Charles Spitzer" 
Newsgroups: alt.home.repair misc.consumers.house
Subject: Re: Cutting a 4" diameter hole in wood
Date: Tue, 30 Nov 2004 08:31:30 -0700


"Walter Cohen"  wrote in message 
news:Xn0rd.538$Cc2.310@fe09.lga...
>I need to install a dryer vent from my basement laundry room to the 
>outside.
> The opening needs to be 4" round.  I do not have a 4" hole saw and don't
> really want to buy one as I'll probably never use it again.
>
> Is there another means to make the 4" hole for the vent?  I have a jig saw
> and a multitude of hand saws/drills.
>
> Thanks,
> Walter

scribe the hole, drill a 1/2" hole inside it, and use that to start your 
jigsaw.