modifying a non-skirted TR3 thermostat?

["Mark Gendron" <mister_toad@email.msn.com>]

I goofed and bought a non-skirted TR3 thermostat on eBay. It's a Smiths
#X85035/86. It didn't cost much, so it probably isn't worth the postage and
hassle to return it to the seller. Other than the lack of a sleeve, it
appears to be correct. What are my chances of successfully modifying it by
adding a sleeve? A few months back, I read on the list that a Jag outfit
does this. Has anyone here ever performed such a modification?

Thanks
-mg