The safest way to accomplish this is to use wooden shims.
How to disassemble a wood panel door.
Use two hands and apply only gentle downward pressure to reduce the chance of an accidental slip gouging the wood.
Unscrew the top hinge first and remove the lower hinge with an assistant holding the door in place.
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The first step is to remove the bolection moulding around the panel.
One trick is to build a form and line it with plastic sheeting.
Small razor sharp scrapers reach into corners across narrow profiles and on the end grain of raised panels where no rotary sander can safely go.
Clean out any varnish from the crack being careful not to strip away any of the wood.
The above video was taken from the the tv show the resourceful renovator and is uploaded from our very own store renovators resource.
Then pull it off after the filler hardens.
I use a razor blade to score the varnish and gunk between the moulding door and the panel and then slowly push wood shims under the length of the moulding.
Wood replacement is my first choice when the damage involves a joint or threatens a door s structural integrity.
Press the form against the filler and attach it with screws.
Cut some lengths of 8mm dowel slightly longer than the width of the stile.
Remove the door from its frame.
Depending on the location and extent of wood damage you may or may not have to disassemble the door to carry out a repair.
Pull the scraper with the grain.
How to replace wood door panels.
Use a rubber mallet to carefully bang out.
Remove any fasteners in the corner of the panel with a small pry par.