Chainsaw Repair

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Hi Guys, I have a trusty Mac335 that I have had from new (25 years at least)

I need to upgrade / change the carb - the currently fitted unit is original Walbro wt391, I suspect the diapraghm has gone (not stripped it down yet)

I purchased a new carb kit which states is is good for a range of Mac's, Poulan's etc. mine included, BUT the orientation of the choke connection is almost upside down compared to the original, I managed to fit the carb by turning the choke lever upside down (it worked for that purpose) however when fitted the air filter housing assembly just fouls the throttle cable.
it is not possible (that I can see) to rotate the end of the shaft.

I am thinking that my solution is to use a service kit and put a new diagphragm on,   

Any hints tips most welcome, any pointers to a 'proper' orignial too would help

In the Pic the WT391 is on the left (original carb)

Hi
In the end the best (only) solution was a carb kit, It was a steep learning curve finding that afer market carbs are a complete waste of time and money.

My mac now has a new lease of life with its original carb service with a kit.

Unbelievable how many after markets carbs there are out there, quoting an original Walbro part numbers and the carbs are NOTHING like.