I've had them do probably 100 over the years, never had an issue with the repair.
Edit: I got them confused with Dynajet again, don't know why I keep doing that. Dynajet is the one that's out of business but they did a good repair. Vilco doesn't press in a new seat, they have an insert that drops in an makes a new o-ring seal
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After 6 or 9 months I'd be calling Joe to send back my heads and then send the heads to IDS. 6 months there probably a write off now.Vilco has had three of my pumps for 6 to 9 months I think. I have always had good luck in the past. He told me he had a health problem and was slowly returning to work but has no way of telling me when he would get to my Pumps.