Good day, dear motor talk community, I recently purchased a DKW RT 125/2 and would like to check the ignition time at 4 mm before OT and adjust the interrupter contact, which should be 0,4 mm at OT. I encountered the following problems: 1.Earthful spark plug hole: Since the spark plug hole is inserted diagonally into the cylinder head, I wonder if this could cause difficulties when using a measuring clock. 2.Insufficient length of the measuring clock: My measuring clock is too k My theory as I am oblique on the piston may not be able to work properly? Does anyone have an idea if I should use another measuring tip or if an alternative measuring tool would be better suited? I look forward to your advice and experience. Thank you in advance!