Brother HL-L2300d Series Refill Instructions page 4

http://www.urefilltoner.co.uk/ Original and largest selling do-it-yourself toner refill
How to refill it
Find this flattish area near the product code
Melt hole in this exact position
Shake bottle before pouring
Pour in toner holding cartridge at approx. 45 degree
angle
Clean surface with alcohol swab
Fill groove of blanking plug all the way round with
bathroom sealant, a rubber-based glue like Copydex,
or silicon glue
Plug hole, allowing edges of melted hole to marry up
with glue-filled groove of the plug
Check the plug for toner leakage every now and then.
If there's any slight leakage, clean and seal with a
small amount of silicon glue.
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