I have a brand new 590A1 that I want to install an enhanced safety onto however before I do I need to confirm some information. According to the installation instructions this will not work to replace a "steel" safety as the metal spacer between the safety button and the ball bearing will be needed. As far as I am aware current 590A1 models have an aluminum alloy safety rather than steel. Can anyone tell me with certainty whether a current 590A1 will accept the enhanced safety without any further modifications (adding a spacer) or not? Thanks in advance for your help.