Further to this example,
when KLK declares a Interim dividend 10sen Single Tier..

does it mean my divvy cheque will be nett 10sen and not 10sen-tax ? plz enlighten.. 

so in another way i can treat SingleTier and TaxExempt dividends the same ? as in the amount they declare is the amount we get, no need to consider anymore taxes.
(i'm aware that in actual fact they are totally different things)

The always fear is the underlying stock price going down, which being margin call.

For eg.

You have ABC stock use as collateral for the margin at Rm1.00, which give you 90% margin aka you can borrow RM0.90 or you have used the Rm0.90 to buy xyz stock.

But ABC stock now drop to Rm0.80
RM0.80 x 90% = RM0.72

Either you top up the margin call, aka put cash in the account the differentiate 0.90-0.72 = RM0.18
or face the consequences to force sell the xyz stock.

As long as you don't max out your margin, then there won't be margin call or force sell.

That's why we see some fierce selling when some stocks limit down or drop severely time, as brokerage need to force sell those stocks in the margin account to meet the margin call.

Collateral margin condition can vary from broker house and individual specific issue as well.

Margin call is to protect them (brokerage house) as whenever value of stocks sold cannot repay your existing borrowing

You need to see the market condition as well.

If market is under bearish tone and expected to be prolong, it is not a good ideal as well.
It is a good leverage tool when market is deep down and expect to rebound soon.

Some roughly timing is ver important for the leverage to be successful.

Also, bare in mind, broker house can cut the margin given when market condition is not favourable time.
While some stocks may be out of margin account consideration, if the stocks fundamental deteoriate.

You won't get net 8%, after deduct tax issue.
so, roughly realistic about 6%
BLR now 6.05% -2 = 4%

So you are leverage to gain 2% out of it, without consideration of stock price movement.

But we know stock price swing more than 2% easily.

So the most important aspect is to look for the stock entry price, which is the most important factor for the leverage to be successful.