Small update--we had an unseasonably warm day yesterday, and I was able to get back to the splitter--it now runs like a champ, and I feel like it is now baselined:
1. Carb swap: I looked at parts and they were more expensive than buying a bargain carb. It turns out to be marked Harbor Freight on the box) from Amazon. The gas shut off is different (and a nut was left loose out of the box where it has a second small bowl under the shutoff--Doh!). Installed and I have only a hint of seeking, and no more stumble. May be cheaper directly from HF?
Only change is that the gas shutoff lever is shorter than original, but it is still usable.
Part here:
Carb
2. Drained oil and refilled--it was pretty dirty--I guess with splash lubrication all the crap settles instead of being filtered out. I was able to get my car drain pan under the trailer end, most of the oil got into the pan through the hole in the motor mount plate. (While I was at it, I did the lawnmower too to get ready for spring.)
3. Swapped the hydraulic filter (I reused the fancy seal on the DHT one, because it covers the edge of the filter can so crap can't collect). Cleaned everything thoroughly beforehand, caught the fluid lost in a clean container, and then filtered it in a funnel to put it back into the system. Fluid seemed clean, and no weird smells.
I used the Wix one from Amazon here:
Filter
In the intervening time--the small supply of the log catchers I saw on eBay were snapped up--and I hesitated for a day and the last few of the large tables on DHT were also purchased--drat! So I will probably figure out a way to make my own--wish I still had access to Dad's shop and a full complement of metal working tools...
Thanks for all the helpful posts guys.