They should be firmly fixed in place. If they are loose every time your valve closes the hardened tip will move in the softer rocker arm thus wearing it and getting looser. Also if loose it will be hard to set your valve clearance. They are most likely already worn and should be replaced but you can try and stake them if not to loose. Also check your rocker arm bushings as they might be getting loose to.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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