Honda-SOHC

Dear All.  I'm in the final stages of re-building my K6 but have got a problem with the front brake calliper.  When I bought the bike it had been converted to a twin disc with flexible hoses all the way to each calliper.  I've converted back to single disc and bought the Honda hose kit with the final section being metal pipe.  The problem is that when I tighten the nut down all the way into the calliper the metal pipe is still loose. Scottly on the USA forum was very helpful and identified the problem - the steel chamferred insert that should be pressed into the calliper brake pipe inlet hole has been removed.  My question is, does anyone have a spare insert - or know where I can find one, or can recommend a work around?  Thanks for any help! Best regards, Phil