I'm trying to locate an after market company named Washington Models who produce a resin cast 75mm barrel with a counter-balance weight for the Tamiya 1/35 scale M3 Lee kit.

Does anyone know how to get in touch with them or a distributor who carries their products ?

I'm going nuts trying to locate info. on this company!!! #:-)

Welcome aboard BetioBob. Glad to have you with us.

The only name that rings a bell to me is a company called Washington Armor Productions. They do make resin conversion kits.
Could this be who you are looking for?
If so, the only info I have of them is as follows. I do not know of a web site.

Washington Armor Productions
PO Box 66
Riverdale, Maryland 20738-0066
Email:[email protected]

Update

There is another company who makes an update kit for the Tamiya M3 Lee, which includes the counterweight for the M2 75mm gun, along with several other "fixes".
Kurt Laughlin from Track Link did a review on the kit which can be viewed HERE
It's another one of those aftermarket companys that does not have a website nor (at least not known by me) an online distributor.
Armoured Brigade Models
PO Box 35163, Westgate P.O.
Ottawa, Ontario, Canada
K1Z 1A2
(613)224-6209
Email: [email protected]

Thank you , General Kencelot.

This is the first compass bearing anyone has been able to provide for me.