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Hi All, The valve flat bottom drilling and depth check. Do not try and drill directly with the flat bottom drill as a drill ground this way will jump all over the place. A flat bottom drill is just used to produce a flat surface on the end of a drilled hole. So, the sequence of operations...

Hi Dabbler, Yes, I know but I didn't remove them. They are gone for me also. Apparently, it is a server update issue now being looked into.

Hi All, Just for completeness, there are other ways of "broaching" miniature square holes. On Youtube: 1- Clipspring Spare Parts # 13, 2- Joe Pie Mini Milling Machine The Three Ball Crank Arm, 3- Joe Pie Can you Grind Tools on a Milling Machine? YES--Take a Look!, 4- Course You Can How to Make...

Hi All, The machining of the valve. I knew this part, though it looked so simple on paper, was going to present me with a lot of machining difficulties. It had two internal features, a 7/64" through square hole and a flat bottom circular hole. The flat bottom hole I can deal with as, in the...

Hi Peter, In the case of the Howler 15, the liner is specified as unplated "Leadloy" steel. My take on Leadloy is it was a good choice for cylinder liners where oil was always present but it is a terrible choice for any other use as you can almost hear it rust. If you leave a clean piece of...

Hi All, A very interesting discussion so far - keep it going. Well, I am not exactly up the proverbially sh-ts creek without a paddle as I do have one last piece of GA-50 Meehanite. It was given to me decades ago by Harry Hawkins, a past President of TSME. I don't know where he got it from but...

Hi Peter, No hard chroming facilities here. Will have to outsource and this will present a problem as I don't trust a regular chroming facility to successfully handle a job like this. The specs. say the piston is to be "flash chromed" 0.0003" total to at least 60 RC and then polished.

Yes, cast iron for the piston. But not just any cast iron. Craig Asher knew what he was doing. I have all of the the construction articles and there was a very good reason for using it in this case -because of the design. Using an aluminum (alloy) piston would not have resulted in a lighter...

Hi Peter, Yes, you are correct. It is for a 2.5cc model 2 stroke speed model engine which I started (from a casting kit) when I was sixteen. Craig Asher designed it in 1959 and in 1960/61 it won many domestic speed events. It was also entered into and did very well in international speed...

Hi Peter, One UK site says all sold out and the other UK site says doesn't post to Canada. I know you can source Meehanite in the UK but the shipping cost here is astronomical if and when it is available. I know Meehanite iron is available in Canada but just where...