[QUOTE=ACEd;141970756]Guide Rod / double spring setup looks to be same as 4013TSW/4053TSW and late 4013/4053 and 4516 retrofit parts.

If you choose to convert to standard 9mm, suggest you go for a complete 3913 slide, barrel, recoil spring, guide rod set - frequently found on EB or GB. (May be same as 6906?).

Keep the 356TSW set intact.

Just replace used recoil spring with new from Midway or any of the other common sources.[/Q

ACEd,
Taking your advice I found a 6906 slide assembly complete with 9mm barrel on ebay.
It arrived today. I cleaned it up and put it on the 3913 receiver and took it to the range. It works like a charm.
Thanks.
Les