Louis, The prop shaft seal you cited, is the same one I ordered.
The driveshaft on the seal area measures .472, which I find a
metric seal available in that size, but not with the 1.000 O.D.
I ordered metric seal 4720, which is 12x25x7.
I believe I can use this seal, if I make a new piece that the seal
is pressed into.
M.E. looks to have a replacement for the pump cartridge square
O-ring, but they want $15.00 for one. There may be some on
Ebay for about $10, but more research is needed.

Grease it is for the gear case.
Thanks!

green-thumbs wrote:

Years ago I read an article in hobby magazine about making tires for model airplane. Not actual tire, but, more on order of an O ring to fit over a wheel. As I recall he made a mold and filled it with a rubber material and bakek it .
Apparently the right size O ring was not to be found. Making a square O ring would
be about same. Laugh as you may, some are making impellers, small items and
gas caps by similar low tech
high labor methods,
Louis

Louis, “baking rubber” reminds me of my
Creepy Crawler set I had back in the 1960’s.
My favorite thing was to make the huge spider
and scare my mom with it!
I went ahead and ordered 25-20812 o-ring from Ebay
for around $8, as that’s the replacement number M.E. gave.

Tubs, My cartridge pulled out, and tapped in relatively easy,
but I finally did get one of those heat guns…….. sure beats
using a hair dryer!