6 Inch Adjustable Lockable Steel Divider Wing Leather Compass

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Try a wing compass if you have one, really requires a specific spanner wrench which would require having one made but a wing compass might fit in the gap.Like this. https://www.walmart.com/ip/3960779607?sid=6AC1B949-A655-46F9-A632-CD3995DBA95A You might need a smaller one but at $10 you could get the 6 & 4 inch for less than $20