While I'm sure this is true, unfortunately, and from bitter experience, this
doesn't apply to the cheap ones Wickes supply which I recently installed in
the garage. Two of the clamps on one side have nothing to pull down on to
even compress the silicone.
Based on advice from here, I sought out a *downward cutting* jigsaw
blade of 75mm length. Easily available from the sheds. Mark the
worktop from the top and cut from the top protecting the surface of
the worktop with masking tape or similar.
I cut 2 sink holes and a hob hole in around 15 minutes each. Did need
a blade change after the 2 sinks though ...
Moral is, read UKDIY, measure twice and cut once .. :-)
The usual reason for this is trying to steer back to the line with sideways
pressure, like you would do with a panel saw. With a jigsaw this makes the
blade bend. If you need to steer back to the line do it by gently twisting the
saw in the right direction, and NO SIDE PRESSURE
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