Peterbilt $750 Dipstick tube?! Any workaround?

I'm not a trucker, I'm a diesel mechanic and I have a 2001 Peterbilt Dump Truck that has a dipstick tube that keeps pulling out. At the bottom of it there is a kind of threaded sleeve that goes to the motor and that part is all that stripped. But of course Peterbilt only sells it as an assembly - for $750!!! There has got to be some kind of workaround, but I'm from a medium duty background, primarily International, Isuzu, Ford and GM. I've been in heavies for a year so I'm still getting my footing with the Petes and Western Stars we have. Anybody have any suggestions or had something similar and can tell me what to do to fix this at a reasonable price - right now I tell the drivers to hold the dipstick tube when they check the oil and silicone it, but a couple times a month they pull it out and oil goes everywhere so it's a pain in the you know what.

 

Just the tube thank goodness. Actually on this one the tube slides down into the block and there is a sleeve over it where a piece is supposed to screw down into the block and hold the tube down. Stripped probably wasn't the best word but I was writing from work and had to shut the shop down so I was typing fast - the metal has worn away, and though the sleeve screws onto the block so it seems like it should work, the part where it catches the dipstick tube itself is worn away on both sides so it no longer holds the dipstick tube because there is nothing left to catch. I was thinking of tacking the tube to the sleeve but didn't know if there was any better workaround before I welded because then if it ever really needs to be serviced the weld could make that difficult.

 

That'd work, actually. Cut the bit of end off and bump it out a little bit. It is a compression type. That's perfect, thanks. I've got the truck in this weekend for a timing cover gasket and front engine mount, so I'll give it a shot while I'm in there.