Last year I purchased a second hand hobie 16 (see pictures here: http://www.thebeachcats.com/modules...mp;file=index&include=view_album.php )

The guy who sold it to me "forgot" to mention that the mast was broken and rebuild from 2 deferent parts (see pictures here http://www.qcm.co.il/mast )
The fixing is 1 feet below the tang.
The mast is not water tight at all (both parts move)

My questions are:

Is it safe?
Can it hold the pressures?
Is it common to rebuild a broken mast like this?
What could happen to the crew or the boat in case the mast broke while sailing?

My biggest concern is for my 3 year old and my 6 year old boy's safety.

Thanks,

Erez