Yet another HABTM multiple checkbox query, cakePHP 1.3 RC3

I'll apologise now! There seems to be loads of advice about HABTM in
cake, but I still can't quite get the answer to my particular problem.

I have two tables and a join_table. On my view, I have created a
form, which has a multiple checkbox. The problem I am having is that
this is not returned in a format that I can save it in.

Using debug($this->data), I get this returned to my edit action:

Array
(
[PortfolioEntry] => Array
(
[id] => 78
[when] => Array
(
[day] => 04
[month] => 04
[year] => 2010
)

[title] => Another test
[description] => Hmmmm, will this work I wonder? It
might, although if you do not include full stops it doesn't!
[benefit] => Hello mucker.
[activity_id] => 2
)

[KsfDimensionsPortfolioEntry] => Array
(
[portfolio_entry_id] => 78
[ksf_dimension_id] => Array
(
[0] => 36
[1] => 37
[2] => 38
[3] => 39
)

)

)

The PortfolioEntry bit is saved absolutely fine, however, when I try
to update the join_table with the KsfDimensionsPortfolioEntry part, I
get an SQL error, since the ksf_dimension_id is an array.
I am pretty sure that this array should be something like:

[KsfDimensionsPortfolioEntry] => Array
(
[0] => array(
[portfolio_entry_id] => 78
[ksf_dimension_id] => 36
(
[1] => array(
[portfolio_entry_id] => 78
[ksf_dimension_id] => 36
)
etc....

but I can't for the life of me come up with a 'cake' way of doing it!
Any assistance would be gratefully received.

Cheers.

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