[Steam-engine] Boiler rocks on base

[Richard Strobel]

  G'day all...Life is good in The Big Sky.

  Came across a nice octagon base that fits the diameter of our boiler 
nicely.  Problem is, the boiler rocks on the base.  Should I just shim it 
plumb and then possibly grout around the gap to make it air tight...er what?

  Feedwater manifold is coming along nicely and should be completed in a 
week or so.

  Kindest Regards and TIA,
  RickinMt.