Thanks very mutch for your sugestionsAir tight pod filler with a fair price tag.
http://www.elairsmiths.com/ThePaintCan/
they have cool stuff here
http://www.customproducts-az.com/
especially the new raildrop (for dovetail users)
http://www.customproducts-az.com/new-raildrop.htm
and anything from
http://www.chipleymachine.com/