Repairing French doors

I have a pair of french doors with 2 fixed side panels, the cill plus small areas of uprights where jointed into cill are rotten. I'm considering cutting out and replacing the cill and splicing in new timber in situ rather than remove the whole frame - it seems less work to do it that way. Is this the way to do it ? Anyone had experience of this ? Any suggestions would be gratefully received
John
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Just got home from the girlfriends were she had a similar problem.
We used Ronseal wood filler that is made specially for this job, I purchased 550 gram tin for 7 + VAT from Seymour Wilsons in Ashton under Lyne (run by 2 brothers) the brother who served me told me that when he used it in his bathroom at home he mixed the whole tin and it set solid as he was applying the first scoopful.
Bearing this in mind I made a small batch and my beloved applied the first scoopful and the remainder set solid on the plastic tin cover that I had mixed it on, she learnt too work quicker and filled the hole using small batches.
My beloved was very happy with the result, and if she is happy anybody would be - she is very demanding on standards of work done - 'if it is done right it is always right, if it is done wrong it is always wrong'.
She has used copper Hammerite on the pipes that are showing in the utility room!, for example, and vacuums the dust off the drill as I drill holes in the wall. Nothing is nailed, she insists on screws or of late 'No Nails'.
YorkieDave
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