XTR'02 r.d. SGS to GS + drill modification

[Mulle]

Hi,
here are two questions for the pro's:

First:
I would like to modify my XTR 2002 SGS rear derailleur to a XTR 2002 GS rear derailleur. Meaning long cage (SGS) to short cage (GS).

Well the question is, is it enough to switch the two sideplates?
(Costing 29 €)
OR
are there any other differences on the GS derailleur too?
Meaning I have to buy a full new derailleur.
(Costing 80 €)

Picture can be seen here:
http://www.bruegelmann-shop.de/shop/bil ... 731273.jpg

And a second Question is:
I would like to drill some holes in the XTR-pulleys beneath the tooth. How big can these holes be, without loosing stability/stiffness meaning function.
I heard about 3mm....

Personaly I think nino's deore-pulleys are way too shaved no offense.

[scapin]

No, for me there aren't other differences between two derailleurs.
Perhaps 3 mm are enough.

[IanB]

No, for me there aren't other differences between two derailleurs.
Perhaps 3 mm are enough.

I'll second that.
Look here at my mech with drilled jockey wheels. Also, I've since found that that XT jockeys weigh 19g, and XTR weigh 21g.

[Mulle]

Thanx for the answers.

I think I'll start with 1mm then 2mm then 2,5mm then perhaps 3mm
And then just try to find out what looks best. 3mm looks like a bit much to me.

I once saw a picture on the MTBR.com forum with someone who had an aluminium-pulley with holes worn down, so I know what to look for when drilling.