I've posted these photos before.  In case you didn't see them, this is our solution
  to using wood. We changed over to Bud's SS bow sprite about ten years ago
  and it is on our list of best things we've done.  No more varnishing or worrying
  about rot. It also made mounting the Lofrans electric windless easier 
  This year we removed it to have the u-bolt added for jacklines, etc. That led
  to having it polished, which led to the SS knights heads.  Things tend to 
  snowball on us. Our wooden Knights heads were well worn from from many 
  years of anchoring. At the time of changing over our wooden bow sprite was
  near perfect and we gave it to another Westsailor.  But we believe it was 
  worth the expense and would recommend stainless, especially for a cruising
  boat.  The idea of the U-bolt was Dave Brown's (WS 32 Mandalla) who
  also fabricated the Knights heads, which turned out to be a work of art..
  
  Jim