<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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Then we can remove the base form and fill it with liquid ABS or so.<br>
Instead of increased outside pressure, we could generate a vacuum<br>
with a vacuum cleaner trough a second hole.<br clear="all"><br></blockquote></div><br>A vacuum cleaner may not give much depressurisation. I think you can acheive better pressure difference if you use a tap (maybe you have already seen how to do this during high school?)<br>
<br>Lionel<br>