How far in to press balance shaft seals on 2.2L Accord Motor?

After taking the front off my '93 Accord's motor (timing/balance belts,
crankshaft pully, crankshaft gears, etc) I was going to replace all of the
seals, but I notice that the seal on the front balance shaft was installed
flush with the outside edge of the bore. I discovered that it can go back
farther because I accidently pushed it back a mm or two on one side while
trying to take it out. So how far should it go in? The manual I have
(Haynes) doesn't talk about it. I also am trying to figure if it is worth
trying to get the thing out since it is less accessible than the crankshaft
seal... maybe I should just push it in evenly and call it a day......
thoughts? (They are not easy to take out!)
TIA
KWW

 

just below the surface. it also wouldn't hurt to get a balance shaft
seal retainer from the dealer. they do sometimes pop.
Chip

 

Thanks. Got the retainer as recommended.
KWW