John Your right about keeping it simple. I guess after using all types of rivet guns various rivets and fasteners, you tend to take some of the basic info for granted or consider it common knowledge. Especially after working on F-4, F-16, F-15, F-111, A-10, C-130, B-52, HH-60, H-53, and T-38 aircraft. It's not like everyone would know what size drill bit would be required for an MS90353-4-5 or a MS90353-04-5 (both blind rivets). One is oversize, the other standard. Nor would most people carry around a decimal chart in his/her shirt pocket with the various drill bit sizes with the min/max diameter of the hole listed. Sorry to confuse anyone. Bobby
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