OK, we're talking the plastic dipstrick tube is moving, get a new one Tony. When you knowck out your existing plastic dipstick tubs, you'll see where has "knurls" if you will where it passes thru the block, they wear out over time, repalcing a plastic dipstick tube can often time be part of a normal A-series engine build, they are not terribly expensive. AS far as how the dipstick with the intergrated washer seals, they had a little slip on piece, that over the years come loose, thay are N/A as far as I know, so wy i make my own now, I used viton o-ring before, but the widdle down piece of hose works better, and the carb return spriung keeps everyhting in palce wat better than the factory ever did it.
FWIW, the 948 didn't have the plastic dipstick, or atleast that's how I remember it, they had a metal tube, the plastic tube came around with the 1098 and stayed on in the production throughout the 1275. Tony you can get a new thru Moss. When I put a new dipstick tube in, the knurls will grip the block and make the tube stay put alot better than a old worn one, I seal them where the meet the block exterior with a little black RTV. Hoep this helps