Another wood filler question

I have read a few on here and still not sure as to the best one for my repair.
Its a supporting post for a canopy on the front of the house and has rotted in the corner as the picture. I was thinking of digging the rot out and filling and maybe using some stainless steel screws to give the filler something to hold on to (would it otherwise slump ) at the bottom I need to either cut it off square when set or shape it square when wet.
What are peoples thoughts. I have included a picture of the off the ground support used and you can see the round plate - the nut I have siliconed on a peice of white plastic pipe which is why you can not see the nut.
I do have a tub of Everbuild High Performance Wood Filler

I spent last week doing a similar job.

IMHO, the only way to do this is to chop out the rot until you get to good wood, square off the cavity and then fit replacement timber in. Glue it and screw it, then use some two part filler to tidy it up. Otherwise the rot will return (well, it never went away really).

Nigel_Cro said:

I spent last week doing a similar job.

IMHO, the only way to do this is to chop out the rot until you get to good wood, square off the cavity and then fit replacement timber in. Glue it and screw it, then use some two part filler to tidy it up. Otherwise the rot will return (well, it never went away really).

Click to expand...

Its not that big a repair and new wood will end up being very thin in places and possible vulnerable itself.
I fitted the post about 8 years ago and just went for standard pine - all be it structural grade. I thought I would be ok having it off the ground and very carefully painting the end grain, maybe the rot was already in there. I wish I had gone for a galvanised steel post.