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Thanks for following along. Nothing like interest to speed things along.I should have provided more details about my bore finishing operations so will do so now.For boring I used a solid carbide micrograin boring bar. Several people make them and since I have been using the same one for 15 years or so I am not sure whose I am using. But the specs are 0.320 inch minimum bore with 1.25 maximum depth and a 0.365 inch shank. It is the equivalent of this one but a lot less money back when I bought it.http://www.mscdirect.com/browse/Turning-Boring/Boring-Bars-Grooving-Tools/Boring-Bars?navid=12105888+4288237782+4288232280+4288237789+4288232279+4288215366The Flexhone is this one. They can generally be had on Ebay for about 1/2 as much money.http://www.mscdirect.com/browse/?navid=12100209+4288246421+4288168592+4288225324The URL that Roger gave for ACRO laps is a good one, but note that their price list is 7 years old and prices have about doubled since then. They also make metric sizes which are not generally cataloged by USA suppliers but they do sell direct. If you are going to be using more than one grit of abrasive for lapping buy an extra barrel for each grit. After using itl, put it in a plastic bag with a label and always use it with that grit. Never mix grits on the same barrel and you can not tell by looking at it which grit it was used with. Here is a link to the one I used on the MSC website.http://www.mscdirect.com/browse/Abrasives/Laps-Hones/Through-Hole-Laps?navid=12100079+4288090273For abrasives I use diamond compound. Don't be put off by the seeming small amount in a 6 gram tube. I have used about 2 grams over the last 10-15 years. It does not take much. Since I bought mine Shars has started carrying it at about 1/4 the price of other suppliers. I have not tried the material from Shars, but it should work OK. Here are links to both Shars and Enco for suitable compounds.http://www.shars.com/products/view/5291/USBS_9_Diamond_Polishing_Compoundhttp://www.use-enco.com/CGI/INSRIT?PMAKA=619-0158&PMPXNO=16717886&PARTPG=INLMK32Very important is cleaning the bore after lapping. It does not make any difference if you are using aluminum oxide , silicon carbide or diamond compounds you must SCRUB the bore before ever inserting any hard into the bore. No pistons, plug gages or anything hard. If you do residual abrasive can be forced into the bore and will never come out with cleaning. I use test tube brushes, dish washing detergent and hot water. Nylon tube brushes are available at many stores but Amazon has them as well as Harbour Freight. The Harbour Freight assortment only has one or two useful ones for me, but if lyou are visiting their store they are cheap enough to pick up a package. Amazon's has a variety and if you are ordering other things and qualify for free freight they are cheap enough.http://www.harborfreight.com/9-piece-tube-pipe-nylon-brush-set-90631.htmlhttp://www.amazon.com/Test-Tube-Brush-Pack-10/dp/B003LRVR4W/ref=sr_1_8?ie=UTF8&qid=1390050562&sr=8-8&keywords=tube+brushSome general information on what I am trying to accomplish which is plateau honing. The Flexhone leaves a relatively rough finish with grooves on the order of .0005 deep. When lapping this only the tops (plateau) is removed leaving these grooves with very smooth tops. These grooves act as oil retaining areas and reduces the sliding area reducing friction while still maintaining a very good seal. For more information do a search on "Plateau honing". It is being used quite a bit on high performance automotive engines. I don't know if l am accomplishing this or now but it makes a good story. I do know that this procedure works for me.Any questions -- just ask. I may not have the answers but you can ask and others may chime in with the answers.Gail in NM