Hello in the round. Have a TGB 50ccm 2tacking. I get only 2 bar compression. Cylinder new. Simmerimge all 3 new. When I release the membrane block, I have 2 bar pressure on the cylinder. With membrane block also…….. but it is dense. There is no gap light coming through…… where can that still lie…. come no further. All seals are new. Please for help thx