Can you cut a old fiberglass mast down

i have a old 460 1 piece mast from old eBay gear ( RDM)

could i cut it down to make it a 400 ?
i know the following :
*cut it straight
* dont go to fast or it will split
* cant cut too much as it taper in and wont fit around base



was thinking about fiber glassing around the foot to strengthen it

but are there any other tips .....

was thinking about rotating it and placing tape so it straight
hacksaw , grinder with cutting wheel