This should work for most Hamers:
http://www.rsguitarworks.net/catalog/product_info.php?cPath=31&products_id=97
the jack is a switchcraft: www.tubesandmore.com search: W-SC-152B
Andy
http://www.rsguitarworks.net/catalog/product_info.php?cPath=31&products_id=97
the jack is a switchcraft: www.tubesandmore.com search: W-SC-152B
Andy