Watch this video to find out how to replace your polyamide mallet insert quite easily. If the insert sits firmly on the mallet to such an extent that the handle threatens to break during loosening, we recommend the following:
Use a hacksaw to saw as far as possible into the front of the insert. Then continue the saw cut on the side all the way up to the body (metal body). If this does not help, drive a chisel into the saw cut to split the insert in two. This is the latest time at which the insert can be removed.