Thanks Old Guy,
For the felt,what thickness do you recommend?4 inches seem to go beyond the aluminium cap(3.1 inch diameter).Should it be that big or should it be a 3.1 inch diameter of felt?For the felt not to fall down are you suggesting to glue it( with removable glue?) on the whole surface of the cap or just on the hedges?Finally if i hear an improvement with the felt would you recommend to take the further step and replace the metallic caps by paper caps?
Thanks.Charles.