Super C Hydraulic Pump Shaft Wear

The hydraulic pump on my Super C was leaking fluid into the crankcase so I removed it and am replacing the O-rings with those supplied in the Touch Control gasket kit. I have read on this forum that if the shaft is worn too much a speedi-sleeve is the answer but am wondering how much is too much. I measured the shaft dimeter on the smooth part and in the groove and came up with 0.623 for non-worn spot and about 0.620 in the groove. While you can see and feel this the amount of wear doesn't seem too excessive.

I should note also that the O-ring seel looked to be in bad shape as it was brittle and the inside edge was hard and had several grooves in it.

For reference there is a place close by that does carry Speedi-sleeves so if tat is the correct answer it wouldn't be too difficult.

Lacking any other advice I am thinking of just putting it back together and hoping that the new O-ring will fix the leak.

Am I inviting another rebuild by not putting a sleeve on the shaft?

Thanks in advance.
Lance

One question though... I was under the impression from discussions on this forum that use of the Speedi-Sleeve would not require enlarging the shaft hole (I think that I read that the sleeves are about 11 mils thick). If it does require enlarging then the decision is even easier to make since I don't have the tools / experience to get that right and the cost to have a machine shop do it might be a little high (especially since I live in a suburb of Washington, DC where you don't drive by a machine shop every day of the week).

A big thanks to everyone on this forum (past and present) as I have learned a lot about these old tractors by searching the archives (I own the M that was on our family farm when I grew up in ND and now have a Super C and a Super A in Virginia).

Lance

Pete