Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Len,..yep,...simple enough tool for the usual cylinder wall issues, but this little M90 engineering marvel is kicking my a@# longtime engine experiences !!...When you find a full floating piston pin happily stroking away within a Steel con rod bushing Without any retaining clips or buttons & freely bumping & riding the cylinder liner Without causing any scuffing damage...it somehow seems to work within that unbelievably hard, thin, .065" non-magnetic liner that i can't manage to get Any size drill hole thru yet.....maybe this aint yo average iron liner deal...i've punched holes in usual iron,aluminum maybe titanium even but my first encounter with "undrillium" metal ?? Help !