I used 2 half moon shapes Rob, but left a gap between them. It was noted on here that you cannot have any gap. For this year I am going to do like Jim, wood on the bottom and a disc on a threaded bolt for windage. I will coble something up for that part. 2 pieces of wood works fine, but its a pain to get out the file to adjust it. lol I used barge cement to bond it to the riser, no issues. You will want to seal the wood, so you dont have swelling issues in humid weather.
Here is mine with a piece of foam filling the gap. It will be updated prior to the season. Looking at it in the pics, man does that look hidious. lol
