I just finished this routine.

Gently remove the hose clamp.

Hold the "bulb" in one hand and rotate the upper band which has the
"ears" for turning. You, or a helper,  may have to hold the threaded
stainless steel
ring from above with a suitable shaft wedged gently into the drain cross
members, such as a
wrapped screw driver.

Lower the bulb component.  It is two-part. The bottom "butterfly" is
delicate, and it may be rusted, so be gentle with that turning, too.
Clean the rust and apply a bit of lithium or marine grease, or other
"helpful" salve, in
the threads.

Upon refitting, place a standard thin washer (Home Depot
plumbingsection) below the ring and against the
bottom of the sink. All the fittings are pressure.

Tom Hanlon
Palm Springs, CA
84 Westfalia

Puzerewski wrote:
>
> Can anyone tell me how to remove an old ptrap without destroying something??
> I do not want to bust anything else on the sink!!!
>
> ADam Puzerewski
> 81 westy