Screen door tension spring/roller unit

A handy person from colorado springs says:
August 27, 2014
I need new screen door tension spring/roller units for a sliding door. I assume it is a Certaintee door unit because the house has Certaintee 400 series windows throughout. The sliding screen door has a very thin tension spring/roller unit that I have not been able to find locally, even at a larger local window installer and distributor with an in house repair and storm window fabrication operation. Maybe you can help. I've attached some pictures.

The screen door will not accept the typical 3/8 inch wide units. I measure the old unit at a whisker over 5/16 OD. The steel wheel is a 1/6th short of 1 1/4 inch and the width is slightly over 3/16 OD. The overall length of the unit holding the wheel is 2 inches.

The option I've been given locally is to replace the door. New wheel units is all that is needed. However, I understand that Certainee windows was sold to another company, so in effect is no longer on the market.

Hopefully you can help.
Thanks Fred
User submitted a photo of their roller.
User submitted a photo of their roller.
Profile picture of Paul
Paul from SWISCO responded:
August 29, 2014
Thank you for contacting us. Yeah, your width is definitely under 3/8". I'm surprised that something like our 84-016 won't fit, though. Reason being that the corner that corresponds to that roller (our 95-020) is also 3/8" thick. Check the cut out where the wheel goes into the screen door and see if you have enough room to accept a 3/8" wide housing.
A quick learner says:
August 29, 2014
The slot in the screen door is not large enough to accept a 3/8 inch wide roller unit. The screen frame can not be expanded to accept it either because the unit must be able to float in the slot.

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Dave Sr. from SWISCO responded:
September 4, 2014
That is very odd. I haven't been able to find anything that matches these specifications. On the cut out of your screen door, is there any material that can be filed off? Or is the metal completely cut out of the door? Could I maybe see a picture of the cut out itself? That might help us recommend a solution to this roller problem.
Screen Door Roller, 1-1/4" Dia Nylon
Screen Door Roller, 1-1/4" Dia Nylon
84-016
$2.85
Acorn Patio Screen Door Corner
Acorn Patio Screen Door Corner
95-020
$3.75
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