Problem closing door after replacing upvc door frame rubber gasket

Hi,
I bought 10 metres of R6381X uPVC Gasket to replace gasket that is startin g to crack and fall apart in lots of places on my various doors and windows . The profile of the new gasket matches the gasket currently in my door fra me - the difference being the width of the part that holds the gasket into a narrow channel in the frame. The published and supplied gasket has a widt h of 5mm between the "edges" and the measurement of the currently fitted ga sket is about 5.4 mm. I was able to easily fit the new gasket although it d oesn't feel securelt held. I was guessing the old gasket "spread " over the years. The problem is the new gasket prevents the door closing. I have che cked carefully where the gasket channel turns at the corner of the frame - and it does not seem to protrude. Is it possible that the new gasket is jus t too thick (it doesn't seem to be) or is there a "trick" to fitting new ga sket?
Thanks,
Clive
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The new gasket seems thicker than the old (this is by about 1mm!).
To address my own question, I have found online gasket with code R6346X whe re the part that fits in the door channel is 5.6mm (the width of the origin al - so should be much more secure) and there is what I can only describe a s a "double edge" next to the flipper part of the gasket - this was not on the gasket I bought originally. We shall see if it is a better fit.
Clive
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Used to be a tool for it, but one of the main annoyances I have had is that the actual depth of the bit that goes in the channel can be at any bit too deep or pointed when the slot actually has a flat bottom not a v shaped bottom. this then makes the gasket pop out and the door won't close any more. Getting the right stuff is very hard as certainly I have no idea who made my doors. Brian
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