Need help with NMS code (block modification)

Hey guys!

The way I used the code worked until 1.2.5.
With 1.3 it works only with some blocks (like doors. but no levers for example)

nisovin - maybe you know something? I know you are very good in NMS code!

Code:

			// Block GLASS = (new BlockGlass(20, 49, Material.SHATTERABLE, false)).c(0.3F).a(j).b("glass");
			Block.byId[Block.GLASS.id] = null;
			Block.byId[Block.GLASS.id] = new CustomGlass(Block.GLASS.id, 49, Material.SHATTERABLE, false).setHardness(0.3F).setSound(Block.j).b("glass");
			try {
				Field field = Material.SHATTERABLE.getClass().getDeclaredField("I");
				field.setAccessible(true);
				field.setBoolean(Material.SHATTERABLE, false);
			}
			catch (Exception e) {
				e.printStackTrace();
				log.warning("BlocksOnGlass couldn't modify the glass block!");
			}

(Side note, in the CustomGlass class I only changed the method c() to true - means render as a full block)

Any help is appreciated!