I picked up an Ottowa a while back up north.It still had the original sinclair etched cylinder in it with a red sticker on it advertising something(I forgot)!When I removed the cylinder I used a GM lubricant and just kept spraying it on the white sealant letting it soak in.The caulking just seemed to loosen up rather quickley and I just kept working on it till done.Just sold it on here a week ago!