I bought a Buck's Bronco from a guy recently, a 2002 model and I'm having trouble inflating the bladders on this boat. I have a cheap big bore air pump, but none of the funnel like attachments fit well into the Buck's little bayonet connection. (Like a big hollow BNC) So I can't get the pressure very high to start with, then when by the time I withdraw the pump, take the bayonet fitting out and close the value, it's pretty soft. Am I going to have to buy the $40 version pump from a fly shop to make this easier? Are those pumps the perfect fit?