I slide the impeller down to flat spot on the drive shaft and then put the pin in and "try" to slide it the last 4" to the spot it needs to be. Is the a trick to this? I can get it in the impeller but I am afriad to force it the rest of the way down. Any tools to use. I have a habit of breaking things that require a lot of force. The older I get the wiser I get. Motor is a 1978 9.9.<br /><br />Thanks,<br /><br />Rick