I'll be tightening the holes a little. but I'm still trying to figure out how I'll get access to the needles, and just as important, is access to the cylinder heads to take the caps off and make valve gap adjustments. The GG has the IL-230 extremely tight in the cowl. The only way you'd be able to make valve gap adjustments would be to remove the engine completely from the air frame. Not a simple task. I'm open for discussion on this, but I'd like clear access. I'm thinking designing an access panel. It might be tricky with baffles, air intake and front engine support bracket in place. Otherwise I'd just make the complete lower half of the cowl removable. So, anyone else working on the GG and a Kolm, I'd be interested in hearing your thoughts. I understand that once the engine has settled in, these types of adjustments are not made often.