Bought the futuro 1" tip, boiled it, soaped it, and used every inch of strength in my ageing body to get it started; after 15 minutes of sweating and a near hernia I had about a 1/4 inch on and quickly hopped outside to pound it on the ground and get it all the way on;
as I stepped onto the porch the tip blew off like a cork from a champagne bottle. After about another 20 minutes I found it in the bushes across the street. I buried the squirrel that had the been decapitated by the jet propelled tip and then went back in and, after cleaning blood and squirrel brains from tip, reboiled and THIS TIME SUCCESS.
It took me 2 days to physically recover from the strain on my shoulders and pecs from the pushing and twisting, plus now I have taken up drinking to escape from the horror of the squirrel mutilation, but now the tip is on and it REALLY WASN'T WORTH IT.
If I can't find a bigger diameter tip I will go back to the crappy tips from Home Depot. Plus safer for squirrels and other living creatures.