Hi, I was given, loktite 270. I heated the casing and measured the for and aft play by gapping the clearance between the prop driver boss and the front of the crankcase front bearing housing. There was 2mm for and aft play. I made a distance piece to take up the play. I have had two flights today with my Ziroli p51 and all seems well with just a barely perceptible play. So I am happy to leave things as they are. Thanks for 6our I put.