Paddocks do spin on filters -
You can get a britpart for about 2 quid, or a bosh 'heated' unit for about a fiver.
Bob (photoman) made the comment once that he saw round a factory making filters - they were using hot glue gun.
I would suggest that, if youre having issues with stock units, you spend the £3 extra and try a unit that is sold as being a filter for "heated" systems.