UCEM Front door and a brass doorstep with a brush seal built in. The bristles have gone flat in the middle and so a bit of a draught is coming in. The bristles at the edges (particularly the hinge edge) are fine, a thin line quite tall, the center have flattened out. Any way to change them without ripping everything out?
Normally the brushes are slid into a groove but i have never seen replacement brushes for the floor only for the door part. You may be able to prize the brush out with something like a screwdriver and replace it with something like this cut to length https://www.handlesandhinges.co.uk/patio-door-gasket-seal-brush-pile-in-black/
You can get replacement thresholds bars, but I haven't seen the strips seperate. https://www.raygrahams.com/category/3499-threshold-bars.aspx Have a google for 'POLYBOND Pile Brush Seal'