http://www.ebay.com/itm/170745576345?ru=http%3A%2F%2Fwww.ebay.com%3A80%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dp5197.m570.l1313%26_nkw%3D170745576345%26_sacat%3DSee-All-Categories%26_fvi%3D1&_rdc=1
shows what those two threaded holes on the side of the block were used for?
stuey
England