The only way I have been able to do it is to start the hose on the push lock barb and throw the assembly in to the deep freezer for a while, take it out shove on and sometimes a second freeze was required, to get it to go on all the way, but sure ain't coming off again without a blade that's for sure..
The fitting shrinks and the rubber don't bite as much I guess, but it worked for me..good luck