[Tom Vaught]

I have never brazed the pickup screen to the oil pumps I have used.
I have seen quite a few done that way in the 60s thru 80s.
I have always retained the pump screen by drilling a small 1 millimeter hole on both sides of the inlet boss on the pump. I cleaned up those holes internally with a small file.
Then I inserted the pump screen into the pump inlet and located it properly.
(The pump gears, by-pass parts, and cover were already removed).

Then I used a .9 millimeter (.035") drill bit to carefully drill thru the pump screen tube so that I had a clear hole thru both side of the pump inlet boss.

I use a length of .032" Aircraft Safety Wire and threaded it thru the holes I drilled.
Twisted the wire in the proper aircraft recommended fashion and attached the wire thru 4 aircraft bolts predrilled by the fastener maker. Again using the twisted wire aircraft approach. I have never had a pump screen or the bolts come loose doing this method.

Never saw a "Need" to safety wire the Pump to the Block. Those fasteners always seems to be at Torque spec vs the end of the pump fasteners and the inlet tube.

ONE .032" stainless aircraft wire is not going to cause any restriction to the oil flow.
And that is the medium wire size that is used in a lot of aircraft and auto racing applications.

I could have used the smaller .025" wire but a .031" drilled hole size is a PIA hole size to drill in the pump parts. Having the pump oil screen come off is not a fun thing after a engine build. It takes a bit of time to do the mod but I don't need a welding torch or any real fabricated parts, just some drills and the proper wire, and some time. I have a lot of time these days.

Tom V.