I'm no harmonica tech, but my preferred method is to replace the valve with a new one. - Slim. www.SlideManSlim.com On Dec 2, 2013, at 8:29 PM, Music Cal wrote: > Hi Guys > > Do you have a preferred method of making valves lie flat against the > reedplate when there is a bit of a gap? > > Cheers, > MusiCal