What is it?
Spring steel is very hard and will keep sharp for a long time but only if it is kept cool while being worked. A large weight needs to be added to the spring steel to give a heavy hit. The above picture shows two ways this has been successfully done in the past. Some more detail can be found in section 4.5 on the UN FAO website
Your IdeasUse a solid shaft instead of the 'I' beam or pipe shown above so that it is as heavy as possible. It may be difficult and expensive to find but an old truck drive shaft could work. Click here to draw your ideas or add your comments or files below |