I have a 936-12 soldering station I recently purchased How and what if anything is required to install a 900L-T-2.4D tip on the iron?

The Hakko 908-CK Conversion Kit converts any Hakko 907 Soldering Iron that uses medium mass (900M) tips into a Hakko 908 Soldering Iron that uses large mass (900L) tips.

Conversion Kit comes with:

900L-T-3.2D Large Mass Tip
B1787 Enclosure
B1794 Enclosure Nut
B2033 Nipple