On our B32 the washboard is 2-part…. we used someone in Sparks Marina (but can’t remember the name) to cut the washboard – angled cut and added some vent holes in the top half. The bottom half can now be left in place if/when necessary.
We managed to get hold of a pair of plastic (nylon?) mounting blocks that we had seen on an Elan (via Premier). With a very small modification (additional strip of nylon behind), these are now mounted in the heads.