Well I have the tap and starter, which groove cover is correct ? The one with the bolt and round nuts or the clip retainer ? Was the groove cover on early models die cast or plastic like the repro ones. The reason I ask is that I have a repro one with a clip on hand.
The edger channel cover was always plastic.
The thumbscrews were the early setup, when Victa was promoting the use of the edger channel as a washdown port. The clip was used later on.
This was the washdown procedure, as I recall it:
Back off thumbscrews, insert end of hose, nip up screws enough to hold the hose end. Then run the engine and hose, to wash down the underside of the deck.