I used a round stick about 1/2 in diameter, and stapled sand paper to it, an dused it to free float barrel in the stock.
by th eway ---- back yard modifications----..... I had a Brune mod 4 with 29" barrel, a frien d of mine offered to cut it for me and recrown... here comes the kicker.... he cut it with a saw - was not square - so he used a square and a file and try to ---- get it squeare, then he took a stone put it in the drill and made a crown ( I dont know what angle was on that stone), when he told me that my eyes just opened widly and I was speechless......... here comes another kicker....
He tells me to go and try it out and if it does not shoot then he gonna redo it, so there I go to the range bench it and ........... 1 1/4 inch at 100 meteres with T-22!!! HEY I am not KIDDING!!, this Bruno is a really shooter it will shoot most target stuff within 1 to 1 1/2 inch at a 100meters,
I told the story to another friend and he did not believe, then I showed him the finish (finish is a great overstatement) product - he laughted until tears were comming out...........
Bottom line is that the barel is not square yet, you can see it and the crown... I just leave it to your imagination...