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FM, what is your assessment of using the WA1111 with 2xIMR18500, instead of 2xIMR16340?

In most cases WA1111 works and performs well with pair of IMR 18500
I use same LA with pair of IMR 18650 without problem.
No soft start needed? I can use the stock momentary-on SureFire switch?
and insta-flash.No soft start needed? I can use the stock momentary-on SureFire switch?
Similar question but can I use a WA1111 with 2xIMR16340 and a forward clicky switch or do I need a twisty or soft start? Newbie to incans and want to avoidand insta-flash.
But knowing one held up to 2x IMR 18650, I'll charge 'em all the way! 
Yes (both), with the proper bulb/battery combination.I am new to Surefire, lamp assemblies and such. Will it work with SF Centurion C3? Or Lumensfactory Seraph SP-9?
A spacer for using the module in SureFire brand hosts that don't use the larger outer (not included) spring.What is the function of the red metal ring that fits over the brass pill?